32 is the sweet spot for me (including role actions) because it's 2 crossbar, but stuff like tank stances, summon pets and dance partner can go in a 3rd crossbar since they're only tipically used at the start of a fight and can go in a non active crossbar.

But I'll never stop wanting new skills lol. There is so much more they can do with 32 buttons. Make me use them all!