I don't know how being older than most of us (quoting), validate better your point ? Yep, I am much younger - barely have 2 decades, and yet I can appreciate a game and reject some other games. now to the point, I have been playing casters, sorcerer, mage and warlock and I had a blast. I was able to solo in tactical as well (and know about D&D only because of here).
I think it comes down to personal choice, whether you like this mecanics or not. I don't know anything about "WoW", but did some google search and well different mechanics - where is the concept of having a party w/ NPC in "WoW" ? It seems to be exclusively a multiplayer game (from my google search) and I am guessing you have to spend tons of hours to go somewhere (main objective). I think this is the game about this famous guy name Leeroy (that youtube video is quite funny), but I don't know .. if you get a moron like that in your party, what do you ?! I don't know if we can even compare with this game + WoW is quite old (I wasn't even walking when it started).
so, in summary, I like your views - made me google search a bit - but if caster were to be "stronger" in this game, we would have an unbalanced problem. Cheers!