I think it's a really BAD idea and the game would suffer greatly from its implementation.It is NOT just an optional feature you can just ignore if you don't like it since the quality of the encounters and the individual enemies would need to watered down to fit to a playstyle based on tactics slots.Why?Let's look at DAO:the problem with the combat of that game were:
-simplicistic individual enemies that did little more than stand in front of you and use their basic attack(think about wolves,darkspawn,humans,...).Why?Because said enemies had to fit to a playstyle that lacks the complexity and the precision of full micro-management of your party.You don't need much of that with such enemies. -simplicistic encounters.Again it all boils down to accomodating a play-style that excludes (for the most part)thinking about the specific fight.Guess what happens when you don't have to think much about the specifics of the encounter but only about what your abilities do,HPs(yours and the enemies')?Tactics suffer.
-fights were repetitive:the reason is that they wanted you to just get done withsetting tactics slots once so you didn't have to look at menus ever again(tipical Bioware).Just think about how similar common enemies were from a mechanical perspective despite looking so different(humans,spiders,wolves,bears,darkspawn,...or even worse:an ogre and an high dragon required almost the same tactics).
Of course you might say that on hard/nightmare you needed yo actively manage the party but that was due to cheap HP bloating.The problems above were still there and those who wanted a more complex experience(like this game should be) had to endure them(and HPs bloating too).