Definitely need the ability to decide whether or not to use reactions at the time they'd be used, not beforehand.
How do you propose doing that?
Every time you get hit, the game pauses for a pop-up that asks, "Would you like to use Riposte now?"
That would be the desire all 9 pages of this thread are about, yes. People wanting that to happen. For reaction spells, Riposte, opportunity attacks; all reactions. And it's apparently what they do in this "Solasta" game people keep mentioning.
I get the appeal of wanting to decide, but that seems like it might get intrusive on an actual play level. Of course, I haven't played Solasta, so I'm not sure how it works in practice. I'm just trying to imagine what it would look like.