I wanted to have a serious discussion, I'll address your last point:

if you use any skill, any attack in the middle of the combo, the combo is cancelled.

you need 3k tp to be able to use that skill in the combo.
Auto attack is the only ability that generates TP, Auto Attack does not interrupt combos, therefore, auto attack can generate tp in the middle of combo sequences and allow you to make combos that require more than your maximum TP.