Slippery slope fallacies are hardly convincing.
Making tank pieces available to glam would not make people stop playing tank, especially if the glam restriction was that you had to be the appropriate level of job to use the piece (i.e. if you wanted to use Rakshasa tank gloves, you had to be a lvl 70 tank).
Prepare for me being long-winded now! I hope that it's semi-easy to read since I just woke up and all.
I am not sure if the harassment thing is really what you think or not. If so, you do not need to worry because no one would get upset if someone decided to glam the aforementioned Amon hat onto a class that wasn't BRD.
But, since you have a lot of reasons why it shouldn't be unlocked, I will give you literally every point I can think of.
1. Lore. The only pieces of gear that have any lore significance are the AF. I can understand and would support keeping AF locked, because there is a reason to. Other than that, there is nothing. The only piece that jumps to mind is some of the Crystal Tower Scylla stuff, but even that is immediately shattered when (hello again) the Amon gear comes into play. Amon was not a BRD, he was a magician. So, why can BLM and SMN not wear it?
2. Style. People want tanks to look like tanks and healers to look like healers. First off, we are playing Final Fantasy.
Second, there is growing to be enough jobs that thematically they do not even share the same style. The most egregious one currently is RDM vs BLM/SMN. Style wise, RDM looks absolutely awful and makes no sense in so many of these casting tops. Too long. Designed for a class that doesn't charge in and do backflips. You know what they do look nice in? Scouting and Aiming gear.
What is going to happen if the add DNC to the healer list? There is no way in fresh heck that a DNC would ever fit in thematically with anything in the healer gear arsenal. What if they ever make a caster tank? They could easily solve this by making DNC use DEX as their healing stat and shove them into the scouting gear, or make the caster tank use currently existing caster gear, but now they are facing the problem that the current casters have.
Third, they break their own style rules and put in restrictions that make no sense.
Why is this healer outfit okay?
And this one not?
The bottom one is far more thematic than the top, but yet it's the one that is restricted.
Why are these gloves okay?
But these banned?
They are not intrinsically different, but we are not allowed to use them because "NIN gear would look silly on MNK". In reality, no... the majority of gear would not.
3. Clipping. Wah. Everything clips. Next.
4. Harassment?? I question mark this because I think it's not a real point? Possibly? Nothing should be restricted because of potential or perceived harassment unless it is directly harmful (i.e. chat restrictions are dumb - restrictions on new members withdrawing FC funds is not).
5. Taste. This is Yoshi-P's argument and it is so weak it fell through the moment it was spoken. This seems to be the go-to argument for most people against it and well... it's bad.
Taste is subjective, and your taste is not law or even a good opinion. I personally cannot stand fem Au Ra at all. I wouldn't shed a single tear if they came in tomorrow and said they were deleting them, but I would never ask SE to not allow people to play them due to my personal taste because I know people love them. There is nothing really wrong with them, they just don't jive with me. Likewise, I expect people to extend the same courtesy to my choices.Which they don't. Queue another 'hee elezen r ugli XD' thread.
6. Technical issues. Knowing SE, this is more than likely the culprit. If they had coded their glamour system properly, unlocking things would be as simple as making the switch from FALSE to TRUE.
Not an excuse in my book, considering that hefty AAA title they carry.
Now for good things...
1. It would increase the number of people running content. Yes, I know I would hop right back into Saint Mocianne's for some farming if I knew that I could use the Coat of the Red Thief on my casters. I would start those Alex and Sigmascape farms for all the glam in the world. As it currently stands now, I hate MNK and SAM. But I like MNK and SAM gear. Does not mean I will farm for it, because I won't. That's one less healer/tank (I swap) in the queues.
2. Creativity. It would allow some awesome glams that are currently unable to be used. What is better than seeing more variety in clothing around Eorzea? More gear means less homogenization and in a world of cat and lizard waifus, that's a bonus.
3. It takes absolutely nothing away from those who want to be more traditional. I am in the same boat where I want my tanks to only wear heavy armour. That's my choice. I like that style, but neither do I get irritated when I see a bikini tank. That's their choice on their character, not mine.
If you want your WHM to only ever wear white robes, you can still do that! You can still be a purist, you don't have to put Amon's hat on your BLM. You are happy because you still have your choice, and now someone else is happy they get their choice.
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Sorry if it came off as slightly aggressive towards you Schan, I tend to have that tone with everything I write.
I am genuinely curious to what you think is the catastrophic drawback, because I literally cannot think of one that has any weight except for the hurt feelings of those who want people to dress the way they like it.