Solasta be like: Big window telling me "Enemy is going to run away from you and you can do an attack of opportunity. Would you like to do an attack of opportunity?"
Lots of words. Big window.
I was saying something more like as the enemy is trying to run away, the game pauses and the UI flashes, showing your melee button.
I see. Well, it that case I think that the window is better because you can place all reactions there at the same time in case of several characters reacting. In the case of UI flashing, highlighting the melee button, you'd have to switch to other characters to see if they have AOO available and choose to use it or not if so. Imo Solasta system is functionally perfect and can be just visually imporved that's all.