What's important is doing a good job with what a game is. And a Baldur's Gate series game should be an RTwP game, as well as a game that respects and honours the other characteristics of the Baldur's Gate experience. Larian should be doing that and shouldn't be making D:OS 2.5 with the Baldur's Gate license.
That... Doesn't make sense when you think about it for more than five seconds. BG1 and 2 were RTwP because that was the best method of adapting the edition of D&D they were made with to the screen.
Meanwhile, 5e has a LOT more decisions every player has available to make every turn, so it makes sense to reconsider whether or not a RTwP system makes sense for converting that.
Limiting yourself to one gameplay style for no real reason other than tradition doesn't make much sense.
(Additionally as much as 5e has some issues, it's still a MUCH more robust RPG system than D:OS', so comparing the two games, particularly before we even have one of them, is... not a good idea at all.)
So, to turn your point from the middle of your wall of text back on you, there is no inherent advantage to Turn Based or Real Time with Pause, what matters is how well you use them.
