Something being the "best adaptation of a TT rule set" is not the same as something being "good." For you, that perfect adaptation of the TT rules is what you're looking for. For me, I don't give a damn about the TT rules, and have no desire to see everything from the TT rules be "perfectly" adapted to a videogame. In fact, I WANT many of the TT rules to be discarded or changed, because I find them to be crap. In an ideal world, Wizards would allow a game developer to license just the Forgotten Realms setting and its lore and not D&D rules and mechanics, so that they could make a game using that setting and lore but with completely different mechanics than D&D.
You may not care about adapting TT rules, but both Bioware with BG 1/2 and Larian with BG3 have stated that adapting TT rules to the pc is part of the goal. Starting with RTwP, that requires the abandonment of several mechanics, because they will not work, is a poor choice, plain and simple.
The mechanics of ruleset, are are setup for turn-based combat, it's not even trying to be "perfect" in the adaptation to realize that they do not translate well to RTwP.
No, what Larian and Swen Vincke have said is that often TT rules DO NOT translate well to a videogame and so things have to be changed sometimes. I totally agree with them in this, and believe the first TT rule that should always go is doing things by turns.
Furthermore, in their early interviews last February right after BG3 was announced, Vincke, the main Larian dev handling BG3 combat, and that guy from Wizards who's always in the interviews all stated for the record that there is nothing in D&D 5e rules that cannot be handled in a RTwP combat system. Nothing. But it was Larian's personal CHOICE to go with TB because that is their thing and what they are good at and like to do in their games.
Finally, Wizards clearly does not buy into any nonsense that just because D&D TT mechanics are TB that all videogame adaptations should also be TB. Not only have they explicitly said they intend to make other future D&D videogames that will use RT/RTwP combat, they are actually doing so with the Dark Alliance game which is RT.