I also had the same thoughts when i saw that video way back then, i thought it was way more interesting that the stiff two point system, however after playing “old” AP system games i understood why they did it. there was also a part in the video were they said using the AP to increase the aim of the soilder, this would be a nice a add-on too.
P.P is is updating the “old” AP system without going the firaxis route, but the AP system in P.P can be further improved, i came to the forum to talk about what was bothering of such system, even though small, it is still something that is present, the visual representation of unspent points in the game.