IMHO
i didnt found anything at endgame what i didnt met during leveling, every single mechanic what did you met at Pretorium, AK was introduced before (dungeon or main story). The option of opt-out from leveling throught dungeons its not bad, it only make you spend few seconds on "describe how to kill this boss" before pull..

Becouse ENG isnt my native language I make few macros where i explain what to do and how to do on every single boss ,its so much faster and it makes wonders