Sorcerers Apprentice
Hero
Or just do more damage and have more HP, that's the easiest thing to adjust. I don't think they're going to significantly adjust the hit bonuses.Speculation based on the comments of the designers.
Monsters will be adjusted to actually match their CR. Therefore some monster would have to get higher stats or get disrupting magic.
The AC gap between AC-optimized characters and others is just too large. Any creature that can reliably hit a Bladesinger with Shield up will hardly ever miss a regular non-optimized character, and feeling like your character is defenseless is no fun for the player.