I like the multiple tier sytem, but I'd like to refer to tactics as far as usability.

once you hit 75 in in XI, tier 1 spells were pretty much useless. i'd like to not see that happens. if i get an ability/spell it should be relevant no matter how long ago i learned it.

In tactics, the higher tiers had more power at the cost of longer cast times, but also the AoE was increased.

to add utility higher tiers could have additional effects.

I'd also like to see null spells on a new caster class (geomancer/arcanist?) and not just tacked on to CNJ or THM.