I hate the idea of single button combos.

BUT what I think could be done and would be fairly helpful to kill (some) button bloat on jobs would be an AoE stance.

Instead of separate abilities that you press for AoE fights, it would be a stance that you throw on and you just do your "normal" rotation which now has slightly lower potency and cleaves. Cleaves would be added to some OGCD attacks too (every expansion, more and more single target OGCDs are getting shared timer AE equivalents, so most will have this). The idea would be to get rid of the emaciated AE rotations that most jobs have and make it so that the game reinforces the job's rotation more (rather than dungeon runs being about 9 minutes of your actual single target rotation and more time doing "boring" AE rotations.