I completely laugh at the idea that "true gameplay customization" in MMORPG's is the talent system we have today in WoW.
If your idea of "true RPG gameplay customization" is changing talents between AoE or Single target in between pulls...lets just say...we cant be friends anymore
lol
Customization in WoW evolved into what we have today BECAUSE of the gameplay limitations from being:
-PvE
-Holy Trinity
-Linear combat System
What you so much enjoy to do (min maxing) stems from the FACT, "PvE in WoW is a 2D game from the early 2000's", so the customization evolved to optimize a "2D game from the early 2000's"
What you so much love...is nothing but a joke to the RPG genre.
Also when you ALWAYS min max you are no longer playing a Role Playing Game, you are playing an MMO about min maxing.
Maybe try and understand what you so much enjoy about the game (min maxing in WoW PvE) goes against everything a Roleplaying Game is and designing the entire customization system of this game around this "crap" is a paradox in itself (for the RPG genre)