I play Factorio instead of WoW because I don't like when developers can change my character, without my permission. MMO probably has to be that way, but it is just a bad investment to put so much time somewhere I get no promises or security in exchange. (To avoid being negative, I'll add that I'd play MMO if it required no commitment, and anyone could join or leave freely. But this would ruin most people's motivation.)
With Classic WoW I guess there will be fewer surprises. I hope everyone has a better time with MMO than I did.