It's not that simple, since it's not just about tweaking numbers, but also changes in actual game logic / mechanics. Designing (and maintaining) different modes for that would multiply the effort required.
Better handled by dedicated modders who care about this a lot.
Personally, I used to be very invested in BG3 being as close to 5E as possible, but I've become a lot more relaxed a while ago, so I nope out of many of these discussions at this point.
To me, BG3 is "based on DnD 5E" in many ways, but ultimately doing it's own thing, and for me that's fine. I'll enjoy the game regardless, because I'm looking for storytelling + meaningful choices which for me don't primarily happen in combat or on character sheets.
