If they give us more abilities at level 1. They would have to change the enemies to require those abilities to be used. Otherwise, it wouldn't make sense to have more abilities than needed.
You heavily overestimate how badly early game is already tuned 3 expansions later.

You could level some dps classes (Dragoon specifically) by mashing 1 button instead of your actual damage combos for a good number of levels.

Hell, dungeons were balanced around cross-class spells being a thing, and situations like: every tank having access to an ae +threat that wasnt on the primary resource, or every healer (and one tank) having access to regularly available mitigation in stoneskin.