My guess would be the new cap is 12th level, which allows a few fun things including a third feat, but stops before 7th level spells, which include several tough-to-program/balance items like Etherealness, Plane Shift, Reverse Gravity, and Simulacrum.

Useful higher level spells like Resurrection can be given on a limited basis through scrolls or items (which they’re already doing—Speak With Dead is a third level spell, even though EA caps at character level 4), but unlimited access to 7th level spells introduces a lot of complications, potentially more than they’re willing to deal with for “just” one more character level.