I like agreeing with people. It's nice.
To answer your last question:
Because (1) I estimate the probability of people being harassed for "continuing to play as they have" as much more likely than you seem to, (2) you're telling people to play in a corner, too, just a different corner, (3) I much more highly estimate the impairment this will have on people, and (4) this collectively shifts my view of it into a zero-sum game of sorts; it isn't win-win or all benefit-no cost.
The idea from the complex camp seems to be something GENERALLY along the lines of:
"(1) People can still be bad/play simple, (2) they just won't get to clear some content they can clear now, but (3) SURELY it'll be such a negligible loss and they don't bother to get good and adapt, so they probably either don't care or weren't cut out for that content anyway, so no loss, (4) win-win for everyone, let's do it, what's to lose?"
EDIT:
The reality is, I remember when people would berate healers for not DPSing (hell, people do it NOW), or not DPSing optimally ("I didn't see you in Cleric enough...! Why are you trolling us?!"), while ALSO berating healers for DPSing too much (not a thing NOW, but if party members start dropping because WHM was in the middle of his melee combo and can't be bothered/remember/break it to throw out a heal...) I've seen it happen, so I suspect it would happen again. And keep in mind, at the time I was ONLY doing casual content (I wasn't even doing Extremes until the VERY end of HW when I spent a Saturday afternoon getting my Bismark birdy...on SMN, of all things). So in 4 man casual dungeons. It's like how the community will berate tanks if they aren't doing wall to wall pulls - the game doesn't require or demand it, but anyone not doing it is berated as "wasting everyone's time".
So the idea that people can just keep healing as they are today and NOT be harassed for it is, I believe, a fiction.
The simple people will be FORCED to play more complex or suffer for it, even in casual content. As I've noted before in this thread (I think, several of these kinda blend together...), people complain about others not meeting "the meta" even in content that very clearly does not require it on even a basic level.
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The corner is just a different corner. Yoshi P told you to play in Ultimates to not be bored, you're telling simple players to play only in normals and not farm Extremes, get into Savage, or dare step foot in Ultimates. It's just a different corner, but same energy.
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As a person who does Extremes and has has finally stepped into Savages, I enjoy the content. I find healing engaging and challenging, especially when it's brand new, and even as I've got P1S semi-on farm (got...I dunno, 9 or 10 clears, somewhere in there), I find it enjoyable but still intense. And that's with my simple DPS kit. I've said before I'm a natural healer, my mind works great at deciding what healing tools are best for various situations. My mind does NOT work well with DPS rotations. It's a completely different mental skill. It's why my secondary role is tanking, not damage dealing. Tanking and healing (the healing part of healing) are situational based types of gameplay. You can be proactive, but you're responding to content. DPS is different. The focus is on repetition. It's like the difference between a guitarist and a drummer or bass. The latter have to maintain a constant, steady pace and rhythm while the former tends to dance about more with shifting pace and tome, pauses here or there, etc. A metronome vs free-form musical ad libing.
Under your proposed system, I would likely just never do Savage again, and might find Extremes more stress than they're worth. As these are MY form of endgame, you would be robbing me of that. So something absolutely IS lost. Something I actually value in my game experience.
Now, you can argue I can just "get better" and do it - but again, my mind doesn't work with DPS rotations. Anything harder than WAR I tend to lose my place in, and half the time I forget to refresh the stupid buff. But I can heal effectively in basically any game after 5-10 minutes reading tooltips and a few test heals to see about how much they fill up people's health bars while pressing a single DPS button over and over when not healing. A second if it's a situational thing (I like stuff like Ruin 2 I can use for movement as that's context based, and dislike stuff like Dia/Biolysis/Combust/EuDosis or damage output buffs like Storm's Eye that I have to remember to keep refreshing - though I do like Storm's Eye [WAR] better than stuff like Disembowel [DRG] since Eye stacks twice, 30 sec then 60 sec, so if you refresh it before it expires (8-10 seconds), you aren't hurting yourself, thus giving yourself a bigger window...I still don't LIKE it, as it feels like busywork to just remember to do, but it's preferable if I HAVE to deal with one of those upkeep buffs - again, metronome [DoTs/upkeep buffs] vs free-form ad lib.)
I don't remember the INTJ thing, but I'm the intuitive side, I remember that (don't remember what the counter part to that is...), and that's why the healing side of healing I find enjoyable and a natural fit, but the DPS side I do not.
This is also, btw, why I'm fine with the HEALING requirements being increased as a form of difficulty increase, as my mind works just fine dealing with higher damaging situations and selecting the correct heal for a given situation.
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Leading to my ultimate conclusion:
The proposal is NOT, in fact, win-win/everyone wins/the complex side wins but the simple side loses nothing therefore we should do it as there's no reason not to.
While I can probably nudge myself up a step in rotational difficulty (I have tanked some Extremes on GNB, though I also absolutely parse gray when doing so, I think), the stress level would likely lead me to just not want to do it. And if I no longer have an end-game, I might become one of those people that only subs for MSQ. I might even just stop healing. Would you favor me with the same sorrow I would give you for that situation?
...and there are a lot of other people like me. Does Square want to lose all those subs? Do you?
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This is specifically why I say if AT LEAST/ONLY ONE healer is kept the way it is, I'm fine with making the OTHER THREE complex. It would simultaneously allow you on the complex side to derive enjoyment from your playstyle while not excluding folks like me from having a shot at it.
THAT is the true win-win scenario. I'm just not sure why folks on the complex side are so adamantly against it. Every time I've suggested it, there is the insistence that ALL the healers must change, no exceptions. That even if one (WHM) is left somewhat alone, it needs at least two more damage abilities and some interaction between them, etc. And if it somehow does stay the same, it MUST do less damage and be non-competitive with the other healers.
...when if we just leave one alone and change the other three, the complex side is already getting EFFECTIVELY everything they've asked for - alleviating their boredom and making healing "fun" again for them. But the camp as a whole seems to be ill content unless they get it ALL. And that's what I don't understand as that's what makes it no longer win-win.
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Fair enough?
Or, at least, sufficient as an explanation?