Disagree, raiding is pretty core to wow.
I do this myself.
I know nothing about either but I’d imagine that’s make sense.
Questing, solo or otherwise I’d also say is pretty core to wow, though solo is obviously a better experience elsewhere.
That’s fine when things aren’t mandatory. Pvp and let battles can be completely ignored and non of the story or core features are impacted. Tying the most powerful item anyone can get the whole expansion to Torghast is what makes it a problem.