I'd prefer not to have a combo button and keep skill rotations as they are.

If we keep oversimplifying where does it end? combine all combos to one button press, get rid of damage boosters and just bake them into combo potencies, get rid of alternate combo trees and just bake them into the base combo button, reduce every class down to just spamming one button. No thanks, I'll take my "artificial" difficulty over mindlessly pressing 1 button all day.