For having playing them again a few month ago ( and actually playing DoS ) , i really think that many peoples dont realise we're in 2020. "Good olds BG" will be just some indie games if they were released now. Nostalgia just blinds the people. We were much less critical at the time and was amazed far more easily."
(Almost) Nobody expects Baldur's Gate 3 to be archaic and infinity engine based. Community expected something with original saga vibe, not original saga technology.
It's not an "evidence" or a "fact" that Baldur's gate IP is "superior" to Divinity. It depends of you and only you.
There's no evidence, but there's some trace. Baldur's Gate 2 sold twice as much as Original Sin 2 during times when in general AAA titles sold less copies (for example GTA 3 14,000,000 vs GTA5 115.000.000 or Morrowind 4,000,000 vs Skyrim 20,000,000).
Dont forget that "POE" ( 1 and 2 ) , who are more a "baldur's gate"-like ( and made by obsidian, an another great name of RPG ) are less rated than DOS 2 on metacritic ( press AND users )
That's ultimately stupid comparison. So if I can find turn based rpg rated less that Pillars of Eternity then I can tell people prefer real time combat with pause? Gamers rated Original Sin 2 and Pillars of Eternity for all their aspects, not only general model. Also Pillars of Eternity isn't Baldur's Gate and Baldur's Gate 2 Shadows of Amn is rated higher than Original Sin.
Larian name, for me, in 2020 mean more that "Baldur's gate".
So you expected Original Sin 3 DnD edition and they provide you Original Sin 3 DnD edition with Baldur's Gate 3 name. It's fine that you're happy with that, but you have to understand, that those who expects evolution of Baldur's Gate saga, not Original Sin saga, might be upset and they are.