I have said it before and i will say it again. Turn-based isn't a problem but the art direction, the UI, the aesthetics, the cursor, the pointers, the movements, the animations, the mechanics, the effects.. the character design.. the clothings.. all are very DOS like. they should have put more effort to make it less DOS feels.
So, hypothetically, if DOS had never seen the light of day and everything we saw in the BG3 demo was fresh and new, would that have been okay?