i am not sure if i understand you right. but i also see nothing i would disagree at a first look.
for me personally the old xpac design (TBC to WoD) was more than enough. raids, dungeons, pvp and some dailies etc. is for my taste enough (since there are pet battles, achievements, the „AH game“, farming, collect things and foremost Alts waiting for us too).
i would have zero problems with systems like covenants etc. when its just all about cosmetics and vanity. personal character development by cool tmog styles, mounts, pets, toys, titles and reputation would fit „my“ wow SL and covenants way better. i am personally absolutely no fan of borrowed power systems and foremost no fan of systems that are linked to player power. gear should be for player power. rest should be (MMO)RPG.
but maybe i am just too old.
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first statement: agree.
second statement: disagree.
when first statement is true since vanila aka since 15 years (and it is), then you are REALLY saying that after all that years and lessons learned by Blizzard the actual design is OUR fault ??? hmm, k.
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no offense here, but i do not get your „logic“ in the slightest. imo you are talking huge BS (because it makes no sense to me, not to offend).
1)
even if everyone has every class up and running (which is not true), you can not play them all at the same time with same effect just by relogging. not as long as gear, rep and other stuff is not account wide. means: a class always has an investment.
2)
most ppl (a few years ago Ion stated 81% of them) play solely one class. they have one main they always stick to and some alts, loosely haniging around, or not even 1 alt.
3)
yes, classes were more and more streamlined in the last years. but a) this is for cheaper and easier maintaining (all classes are based on producer/consumer pattern) for Blizz, and b) they drive again away from it, since a few years, because ppl do not like it.
4)
and even if you can switch your class like your underwear, what is your point ???
sorry, i can see you seem to having a dedicated point you aiming at. but it makes zero sense, at least for me.