The problem is that we haven't been told that the current reaction system IS the final one.
Which affirms my initial post on why Larian has nothing to gain from speaking further on the issue. As long as they don't confirm anything, some people will cling to hope because they haven't explicitly denied anything.
You're technically right they have not confirmed Reaction system won't change, but you can read between the lines. This PFH Swen said that Larian is nearing the end of making the game into what they want it to be and they're going to move on to polishing everything and getting rid of bugs and making everything pretty.
So, if you're playing a game with Reactions the way they are, and someone says what Swen said or along those lines, do you think the game is going to go under a major transformative overhaul? IMHO, if Reactions were going to change into anything like Solasta, this would have been the patch for that to happen.