Let. Us. Roll.
I've always liked rolling, it offers the possibility for both the highest and the lowest spreads, or a spread with both an 18 and a 6, which is always an interesting time in my opinion. I'm aware that some people don't like the idea of just being able to roll away until you get the ideal spread, but if someone wants to sit there rolling for stats for an hour in their single player game, then let them.
+1
This has frequently been requested and I'm sure this would be a popular addition. I think Larian stated they intended to implement it at some point too.
Four positives:
1. Rolling is kind of the D&D thing, and some people find the luck of a roll entertaining.
2. More freedom/choices in character creation is a good thing.
3. A common criticism of BG3 is that the game draws too little from the original series, this would be a homage.
4. The origin system makes the companions shine, but at the cost of making a custom player character feel generic and boring in comparison. This was a prevalent issue with DOS2 and Larian promised they would counteract it in BG3, but I see little/none of these implementations. Rolling would potentially enable the player character to actually stand out a bit.