I don't even remotely care about the level 90 talents, I picked MF because although it doesn't do what the tooltip of the spell states (increases ALL aoe spells by 500%) I still found it to be the least useless talent.
AV reflects a trickle of negligible damage and is actually counterproductive in PvP.
And for the life of me i'll never touch that horrendous KJ with a barge pole, i'm already immobile as it is, rather not have a snare on me tyvm.
So yeah, MF simply as it's a QoL improvement, the other two are junk. Guess I can take AV for some passive damage increase in raids, but hey, it's not even "fire and forget" it's simply passive... What kind of "interesting" thing is there about your level 90 talents being counterproductive or unnoticable? I dunno.