for me, I'd much rather then hewed more closely to the actual P&P rules.
The BG games were good - they got me into D&D lol, and their storylines were great and kept me playing for years (a ritual of mine was to replay the trilogy at least once a year, usually over the summer). But learning what the actual game was like, was crazy, I remember then playing D&D3e before it properly came out and then NWN coming out too, and actually being annoyed at it's changes to the base rules too lol, I still loved NWN as well though, back in the day.
I'd really like to see BG3 stick closely to the actual rules though, because I think there is a real potential to it as something greater than "just" BG3 via the DM tools that it'll likely eventually get, if it has proper D&D rules, it could even become a platform people choose to use to run D&D campaigns, which in turn could lead to a vibrant modding community. The possibilities there feel endless.
Thing is, BG3 isn't BG3, its a game that happens to have Baldur's Gate (the city) in it, so far we've had no real implications of tangible proper links to the originals, so whilst I look forward to the story, it doesn't have the same vibes as a true sequel might. Who knows, maybe there will turn out to be a proper tie in to the originals down the line (and I don't mean just to a character like Minsc, but perhaps references to the Bhaalspawn saga etc - but then the issue is you dont import save games etc, so it wouldn't be mine anyway). So ultimately, all i can hope for with BG3, is a good D&D game that plays like D&D that happens to be set in one of my favourite fantasy settings. Take away the D&D element, or jumble it like it currently is, and it really doesn't feel like it was worth the hype based on what I've seen of the story during early access... which is a bit sad.