I meant diversity of builds for competitive GRs. From that perspective anyone can slap together some random build and claim it increases “diversity” while not contributing on that end. Same idea goes for solo play, it’s just less effective competitively compared to MP.
Going back to the first point, players optimize (in this game, not sure about WoW) because there’s a discrepancy in the power level of builds and they simply figure out which one’s the most powerful and use that. If the game were balanced to have multiple builds at that level, there’d be less min-maxing and players could have “fun” without having to resort to some random potato build. Believe it or not it is actually the developer’s responsibility to protect the players from themselves.