AOO and several other reaction spells are already in the game and it happens automatically that's good enough.
It really isn't though. Right now the reactions don't even always work or happen, but even if they were to work; you don't always know what you want to do until the battle is happening, and then you might have clicked away some choices you truly wanted to use, but even before they happen, you might have already procced a reaction that you didn't want, like an AOO, but instead it turned out you should have saved your reaction for a shield spell.
But even if you only have the shield spell (for instance) active, what about a situation where a small little critter comes up and hits you, and you wouldn't want to waste a spell slot and a reaction on that, because a far larger threat will attack you afterwards? I know the shield spell lasts the round out, but it could be some other reaction. In the cases of reactions, it's all about prioritising depending on what the enemies do and what you think is the best choice for the time being, not depending on automatic procs.
No it is, its in the game. If it works or not doesn't matter, really shouldn't have to say this but you know, ITS EARLY ACCESS!!!!!!!. Truthfully I don't really care, if little critters are standing next to you and you cast shield maybe you should of thought about it in the first place....like really?! come on, use your head and plan your turns out instead of blindly rolling your face on the key board and complaining its not working.
You don't seem to understand my points at all. And I am quite aware it's early access, hence me writing "but even if they were to work". The point is CONTROL. You don't want to lose control to automatic processes that might fire when you don't want them to, and you cannot turn the reactions you've chosen on and off when it's the enemy turn. Hence, you lose control and are limited in making your own calls when you get a chance to a reaction. Did you even read what I wrote? Seems to me you just want to be belligerent.