I dare say they will still have some uses.
FOR EXAMPLE
Back in the day, my brother designed a bunch of scripts for BG2. They were useful even outside of combat, because there was things like 'if wizard does not have stoneskin activated, cast it'.
So bringing it back to Pillars; is there a spell you always want one of your casters to cast, first thing at the start of combat? Whack it into AI.