I disagree that it's just being pedantic. Calling it BG3 does imply some expectations of gameplay. If final fantasy tactics was called final fantasy 8 it would have left a lot of people disappointed and frankly mislead. If a studio made Half life 3, but it played like call of duty or borderlands (even set in half life universe), it would not be what people wants or expects, even if the game in isolation is fine.
Newer final fantasy games have made drastic changes to the formula as far as game mechanics go. Same goes for resident evil games and actually many other Japanese games.
I apologize, I am not game or art critic, I don't even have the right vocabulary to express myself, so I am reduced to vague concepts like "feeling" or "vibes".
I meant that half life, borderlands, gears of war have their own unique identity just as BG and DOS. I am ok with continuation or drastic changes if the new game is doing it's own thing. FFVII had a huge gameplay, graphics etc changes when it continued it's series from SNES to PS. And yet it was distinctly FF game. FFXV is almost unrecognizable in it's game mechanics or graphics from older titles, but it feels distinctly final fantasy game. And the feeling I get watching BG3 footage is that is distintcly DOS game. It's not close enough to BG to be bg game and not far enough from DOS to have it's own distinct identity. As someone said already - if you were watching the footage and you didn't know what game was playing, what would your guess be? For me it has very strong DOS vibes.