If you can spam the same skills turn-after-turn-after-turn, it reduces ...
Well, you probably missed this sentence which is part of the system:
Minimum cool-down is set for all skills(spells) same. (currently 4turns I would go to 3turns)
Frankly speaking
- every skill/spell has cooldown 3-10 rounds
- why 10? you dont need to be fully maxed to get minimal cooldown, you have choice how to get it