Yeah, but you don't necessarily want it to proc on the first enemy to hit you, saving it for another. Therfor, the current system actually removes player choice in how combat goes. I ahve actually has situations where a smaller enemy procs OA and then the bigger enemy walks away scott free even though I wanted to prevent the bigger enemy from moving, I didn't care about the small fry. Therefor I would like to be able to toggle on or off if I want to be prompted for OA/reactions or not.