I don't know how they do it in Solasta because I haven't played it, I just know that what we currently have for Reactions is hands down the most disappointing aspect of the game and is unlikely to be dethroned.
A lot of people agree with you.
At the last Panel From Hell, Larian did imply a change will be coming to reactions. But, we got no description of what would be changed.
I really, really don't want the game to freeze just when a Paladin's attack is about to connect to prompt for Divine Smite.
If they will do reactions as proper reactions / prompts, they should convert as many reactions as they can into active ones, Divine Smite being a good example. >> Charge the weapon as a Free Action until it lands a hit and discharges. Almost the same mechanically but not the massive pain in the ass to use that a constantly appearing prompt that pauses the game at the worst possible moment would be.
Yeah, I think Divine Smite should be a pre-emptive toggle (if the next attack hits). (1) Divine Smite isn't a reaction anyway, (2) it's the ability that would be annoying to have a pop-up prompt for.
But Hellish Rebuke, Feather Fall, etc. should have a pop-up to react to.