I've seen as many abilities, to a more complex and challenging effect, used with only a third of our button count, so I certainly wouldn't mind cutting down on the button count while creating greater conditionals, dynamics, and synergies between the skills. But at the same time, we may as well hit some exact number (including sprint and maybe a pot) as per controller cross-bars, such as either just the one at 16 keys or 1 and then a half-bar at 22. Even as a keyboard player, that seems like it'd be a more comfortable amount of keys, allowing me to place additional tabbing methods, mic controls, focus target, assist, etc., back on less modified keys.

Simply removing the bloat of combos and stance-exclusives (FC/IB; WT/F&C) and tying the majority of new skills into stacked slots (like Meditation and TFC) would probably allow for that easily enough.