Ah, but using Str weapons with sneak attack allows a rogue to use Heavy Weapons and GWF.
Now we are back to the house rule allowing for sneak attack with 2-handed weapons. As I mentioned above, I play a barbarian/rogue and the DM allows sneak attack with any 1-handed weapon. That was his house rule from the beginning. When I made the character, I assumed I would be restricted to finesse weapons as per RAW. And the reason he gave was "A longsword does a d8. A rapier does a d8. What's the difference?" As a DM, I'd let a player try GWF with sneak attacking to see how it works in practice. Such a rogue character does have to sacrifice something. Either they short their DEX and are not as good at doing a lot of rogue-y things or they short their STR and are not quite as good at using STR-based weapons, so it's not a complete free ride Or they short CON and/or WIS, two stats rogues don't normally dump.
Even if you restrict it to non-heavy weapons, BG3 seems like it'll have a plethora of magic weapons with various effects. Allowing rogues to sneak attack with e.g., longswords would greatly expand the # of magic weapons they can use.
That's a total meta reason. I would not accept that as a reason in a PnP game.