What makes WoW hard for you?

So I am socially obliged to play WoW again after quiting when WotLK came out.

I don’t particularly enjoy grinding, and those social obligations rule out cultivating an organized group of skilled players.

Is there anything else challenging about this game? Any content not best attacked by simply out gearing it and being competent at some honestly rather simple rotations and response flow charts? PvP or PvE? I’ll take anything.

Will there be any such content in Shadowlands?

Is there some class that is perhaps difficult and challenging to excel at in Arena, and can win despite being under geared // doesn’t simply dominate when over geared?