How do you know people didn't enjoy the game then but think the changes were positive?
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EDIT:
It's kinda funny, Mr Happy was talking about this in his 3.4 video. At the time, balance was so bad, the meta wasn't just some Jobs, it was an entire party of WAR/DRK/AST/SCH/DRG/NIN/BRD/MCH. The meta literally did not include an entire role (Caster), and multiple Jobs; PLD, WHM, MNK, BLM, and SMN. Double-Melee-Double-Rangedphys was the meta because of how the piercing and slashing debuffs worked and the damage tuning at the time.
Sometimes, people see things in the past fairly.
Sometimes, people have rose tinted goggles.
Sometimes, people have their rose tinted goggles on so tight, it cuts off circulation to their brains.
HW was debateably one of the worst times and possibly the worst expansion in the game's history in a mechanical sense aside from 1.X itself. The story was great, but in terms of functionality and gameplay, it was pretty bad, and up until 3.4, it almost destroyed the raid scene and could have led to killing the game a second time if they hadn't adjusted course, which is probably why they did so.
If you were asking for unglamoured, I could see that (though I don't know why; a lot of the base gear looks abysmal and the accessories like everyone running around with dangly earrings is far more off-putting and historically inaccurate than a T-shirt), but artifact armor is supposed to be rare, not common. And you're basically asking for everyone to look the same, which seems...odd. Especially since that complaint is the entire reason every modern MMO has a transmog system; because people don't like looking all the same as everyone else.
Now, you could ask for a "town clothes vs combat clothes" thing, I suppose. But since we spend a lot of time in towns, that wouldn't change much. Other than the hat, my standard garb is the Lalafell tunic (Blue/Green/Red color matched to role; I like having a "physical" satchel for all the scenes my character either puts something into or uses something from it, not to mention if adventuring, I'd need something to carry things in), Cloud's pants (the only Lala pants that don't either tuck into the boots or hug the thighs and shins - I have no idea why they do that for all pants on Lalas, but I hate it, so go with the most available option that doesn't), and either the High Allegan Boots of Casting/Healing (for those roles, respectively), or brown Hard Leather Boots that remind me of FFTactics shoes. Oh, and the Pagos bandages (also color coded) since they're unobtrusive. And I swap out the hat sometimes for things.
I also like the WHM ARR robes and sometimes use those (with white Hard Leather Boots) or the ShB SCH coat (I like the cape), and I sometimes use the Ivalician Squire chest for my Tanks (sometimes with some gold gauntlets I found that match it, don't recall the name), and when I first hit EW and had just SCH/SMN/GNB at 90, I wore the GNB coat with those same gauntlets. Though those are more based on mood. I'd like a lot more armor sets if they didn't do a "floof" over the butt like Zenos'. I can't understand why that is a thing the Devs have decided on for so much gear (specifically, though not exclusively, on Lalas), but it's obnoxious.
How's that different than the proponents of the past insisting everyone who likes how things have changed either didn't like the game then or is/wants braindead/lazy content?
While I agree with you in a general sense...it may not go ALL the way.
Warlords of Draenor is still considered WoW's worst expansion. That said, Mists and Cata (and Wrath, I still remember "Wrath Baby" as a derisive term for the game being "braindead" then) were all attacked in their time as being bad compared to what came before. Now, Wrath is deified as the height of the game's history by a lot of people, Cata as a monument to challenging and good gameplay (it wasn't, but whatever), and Mists generally gets the credit it should have gotten then.
So there is absolutely a contingent of people who will NEVER be satisfied and constantly saying something in the past was better while badmouthing the present. I'm not saying everyone, though, and I also disagree that EVERYTHING will be praised at some point. I could see EW being looked at like WoD to a point by a contingent of the community. I COULD see if things keep changing those people someday praising ShB, though. A lot of the people that praise SB now complained about it at the time, and that's probably true of HW/ARR as well.
It's either a "you never know how good you have it til it's gone" thing or a "you just will never be pleased and always say something else is better than what you have" thing with a lot - not ALL, but a lot - of people.
...but those people probably won't ever praise EW/WoD. They may praise other things that they currently decry, though.