I understand that it can be tough to fight lvl 89s with myths and that lvl 90s get the clown prize in BGs but adding more layers will only make the q's for BGs impossible. I would rather fight 89 at lvl 39 or lvl up past 90 rather than have long Qs standing around waiting.
for full disclosure: I have two lvl 90s that lack aa's and some lower lvl toons that have difficulty against lvl 89s with more aa, ca and myths and proc gear.