Its frustration. I have nothing but bad experiences with AI with them not using heal even when they clearly have heals available. The AI just perform so inadequately and the fact you cant swap character mid battle is just a pain. Theres so many times i was like let me be in charged of person for this time. Like let me be in charged of the person who i have tanking and then let me take control of the healer when things get crazy but i cant do that. I gotta leave it in the hands of AI and it infuriates me to no end
So far my experience with the game is nothing like that.Its quite the oposite really.The AI is quite competent and they do their roles accordingly.If you like to have more control over the healing part of your party, just control the charachter that do the healing, instead of Rex.Or if you would like to be the tank, control the charachter that is the tank.