ATB is annoying, but it looks like it will be a bit different in this game.
According to some anons, they got rid of magic points and replaced it with the AP bar. The only way you can issue commands like items or abilities is by using AP points. You need to fully fill the bar multiple times for stronger commands and you fill the bar by attacking or sacrificing items making them unusable.
Maybe it won't be as bad as FF where I turn it off all the time. Even in WoFF it was pretty annoying for me tbdesu.