I have zero interest in WoW Classic; I played it the first time around, and that was plenty.
But reviving a retro version of the game and (I assume, due to the surprising popularity) working through the expansions at some point, similar to Everquest’s Progession servers, raises some very interesting questions. While normally you play an MMO and you have no idea what’s around the next corner, Classic is the opposite; you know exactly what’s coming.
We have a pretty clear roadmap for the route WoW takes with all of its various patches and balance changes over the years, and while I believe every class has, at some point, been really strong, I can’t think of a single period of time where they were all balanced. So no matter what class you play, at some point you’re OP, and at some point you’re useless.
(And I will add that just about nobody can agree when those times are; because it is a time-honored tradition in WoW to declare your class “broken” and other classes “OP”.)
In some cases, you could be playing a character in WoW Classic (like 2hand Enhancement Shaman) knowing full well that your spec is doomed; that it will not exist as a viable option in the future. I think it’s an amusing sort of existential quandary, like being cursed with the knowledge of the exact date of your own death.
Do you play around that information? Do you play a weak class in Classic, like Prot Pally, knowing that it’s an investment into something more viable/powerful down the road? Or do you go for whatever’s overpowered at the moment, living it to its fullest since you know its exact shelf life, and simply pretend that winter isn’t coming?