Convenient, isn't it that BG3 will release on PS5 a week before the release of Xbox exclusive Starfield?! Also, since you can play BG3 now, I'd expect there to be a fair number of folks who will choose to get a head start on character planning (and access to the Digital Deluxe Edition) by buying BG3 while they wait for the full release of both games.

Personally, I'll most likely complete my first playthrough of BG3 and then buy Starfield (both on PC).