I'd go even further, I think we should remove Trances from the game entirely. They're just a boring 2 minute button-press tax. And they're so strong that they're a mandatory part of any reasonable build, so they're a build tax, too. And you can snapshot them, so they're an item swap tax, too. And the best way to do that is through a sentient weapon, so they're a fully maxed out sentient weapon swap tax, too. Oh and don't forget to cast Tenser's Transformation and any other short term buffs and potions you have before your Trance, so there's another swap tax, too!
I hate that optimal play has become an exercise in tedium. Just remove trances and buff up Enh/Ins/Qua bonuses for hit and damage on gear to compensate. That way my desire to min-max isn't at odds with my desire to have playing my character be fun.
And still reduce enemy AC at end game on top of that. The formula for it is out-pacing our to-hit way too much.