Chain combo button

[Kabooa]

Because the dance step skills aren't a combo. Because those cartridge combo skills and the main rotation can be used at the same time, granted that would be silly because one combo can interrupt the other combo (oh hey, a chance to make a mistake).

Having other buttons to press that aren't part of your 1-2-3 or 4-5-6 combo chain add the opportunity to make a mistake. It's a level of challenge - albeit a very minor one - that does not exist when all you have to do to play your class is press 1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1.

You know what adds more challenge?

More actions that put conflicting timers and other constraints of their use on each other, which we don't get due to button bloat, which is caused by having combo actions arbitrarily be on different buttons.