Your thread reminds me of an old thread I started years ago on a very similar topic.
The TLDR of it was that if everyone has something, does nobody ultimately want it? The discussion was around rarity of mounts but extended to rare mogs, FOMO items and the discourse that participation trophies should / shouldn’t be handed out.
I can see both sides of the argument…put the best gear in the most trivial form of content, elitists will be upset and Blizzard will lose subscription revenue as people will quit once there is no more gear to chase. Put the best gear behind the most difficult content and casuals will be upset and they make up a large proportion of the general populace so Blizzard and the suits should really listen to their feedback.
I do think this is an impossible thing to solve. And, this is why I’ve been strongly supporting adding gear into the in-game store. Casuals will have access to it. Blizzard may actually gain revenue, depending on how they implement it. Elitists will still be mad because their pixels / ilvl will be invalidated but I’m sure they will find other avenues to stroke their e-peen, be it through IO or exclusive mogs / achievements.