I agree, if you want to enforce the turn system strictly, but in a lot of games a turn involves taking just one action whereas in D:OS you can take multiple actions each turn, which doesn't make sense in regards to time lapse. If you do not like the idea for some reason then that is what is important.
I already gave a reason why I do not like the idea: It defeats the point of having some spells take a turn to prepare. It's also a non-intuitive mechanic.
I do agree it may not be intuitive and not suit D:OS. Thinking about it, my spell idea might make spells with preparation feel less unique.
Naaa, the "one action per turn" TurnBased-System never overs the tactical depth what a action-point based systems over.
I feel the AP system gives the player more freedom and isn't as frustration or discouraging when everything goes wrong due to randomness.
As long as you don't notice things which don't make sense, it's fine, it's just that I'd attack five times when I was still a low level and it would be efficient. I know the AP usage may not be final, but if I want to simply attack, have a lot of speed and the animation is not very fast, it slows down the pace of combat.