I can't say it any more clear. There will ALWAYS be an optimal choice. That's not an opinion.
WoW hasn't evolved into it, ALL games have OPTIMAL paths by nature, including wow. Including your favorite game or game that you suggest doesn't. Trust me, it has an optimal way to play as well. Players will ALWAYS seek and find the OPTIMAL choice. You can't design around that.
afaik, your argument is that there is an optimal way to play and thus there exist no customization. Well, then no game has any customization whatsoever. It's not me arguing that customization is an illusion, it's yours, you just don't know it.