I'm not stating a +1 against reactions at all but against prompts and popup.
You're either reacting or not. If you're reacting, it's on enemy's turn (which you're reacting to), and thus it's either a time-gated thing like in a shooter (won't happen here obviously) or pause and a "prompt" of one kind or another. This is it. All other things that you do on your turn, be it preactions, choosing enemies to "react" to, toggling presets and all that bs simply are not reactions.
If my character is doing things to react the ennemies actions during the ennemies turn : I call it reaction.
You can nitpick if it pleases you or give it another name if "reaction" makes you think too much about what it is in DnD.
??? Like what? I was talking about reactions in general, not just in DnD. And yes, it's a reaction only if you're deciding how to react on someone else's turn (which you're reacting to), not on your own turn (that would be just another action, preaction, toggling presets trying to predict future... all those are not reactions). You do reactions on another chatacter's turn, that is the whole point. And so you're promted to react when the opportunity arises. It's the only way for reactions to be reactions and not some stupid another type of actions on your turn. So you can't have reactions without promt. You can have some abomination on your turn and call that reactions, yes. But calling some person a frog doesn't make them a frog.