Denohonator
I would like you give me some names of games +1 who didn't respect their predecessor.
To respect the basics didn't mean you can't evolve.
Look at Age of Mythology, it respects the basics, still it's innovating.

You said: "The only argument for RTwP I've seen is "BG1 and BG2 had it""

Sadly, you didn't read all of my messages.
I said why, in my opinion, RTwP will better fit BG3 than TB. My point was RTwP is more epic than TB. It's like comparing chess to.... I don't know, lasertag ? Sure Chess is fun but it doesn't have the thrill and the excitement of a good old lasertag when it moves and shoots everywhere.
So RTwP is well suited cause this is the essence of BG. The thrill of the fights, the eye of the tiger.
Secondly, and this is an major point, it's as if you take another game like... I don't know... CoD and just said "we're going to do CoD +1 but it's gonna be TB cause you know it's more strategic and more fun" Well, ok, maybe for you, maybe you're right, but this is not the basic's of the game you take the name of.
I could keep talking about the better feeling RTwP gives about fights but I just move forward to another point.

I don't think the "heavy work" argument is valid when talking about doing a good game. And I don't think it should be this hard to have both of the possibilities considering a lot of games did it.
I am EVER, EVER, EVER, deceived when devs just want to impose their point of view on gameplay when they could easily satisfy everybody.

A good example is "kingdow come deliverance". Never get why the guys decided than you could save only in beds. It was silly and made things so difficult for no valid reasons.
And here we are. Larian could just do both of TB and RTwP (which BTW will give them the opportunity to improve their skills, trying to dev something new for them).
But apparently it looks like they wont be doing it and why ? Because it would be hard to do ? No, just because they want to impose their point of view even if it's against the basics of the game they align themself with and against the will of a big part of their gamer...

True story.

PS: RTwP is way more "realistic" than TB too (which is, also, a big point).