I know you wish really, REALLY hard for people to agree with you on this, but for the vast majority of players who are actually familiar with both games that's absolutely not the case.
You are mistaken. a vocal minority is not a vast majority. Solasta didn't even implement any reaction-heavy class, because it's reaction system is so bad having a bard will turn the combat into pop-up hell. People praising Solasta's reaction system are a very niche group of obsessed 5e rules fans who derive some perverted masochistic pleasure from enacting a clunky and unbalanced DnD 5e ruleset in a videogame. DnD works in a real-life table-top environment because it only serves as a foundation for DM's story-telling, not some Holy Scripture of Irrefutable Dogmas.
I do find it interesting that the vast majority of people who have played Solasta ARE the ones saying their Reaction system isn't really invasive to the flow of combat. There are a few reactions that are, but the vast majority of reactions in that game do not drive people crazy and make combat suck. In fact, one thing Solasta does better than BG3 IS combat. Frankly, Solasta blows BG3 combat out of the water. It's more strategic, balanced, easier to learn, actions are easier to find and understand...
BG3 is getting better, mind you, and I have high hopes for it. But it's not there yet. Reactions is a BIG part of that.
And yeah. Bard is coming to Solasta soon. I'm sure they're also trying to figure out how to not have a pop-up hell.