PvE in practice is still people competing with other people; even the most casual guild in the world celebrate when they beat in realm-ranking other guilds which is explicitly them VS other people in other guilds; even inside the same guild people compete with each other about who is best.
It goes without saying that PvP is just the same with even fewer steps; why is PvE suddenly so much different; it appears the main reason they gate min-maxing for end-game is to prolong subscription money because there is absolutely no sense if "PvP sucks to grind" but PvE not.