Personally I'd like to get an option to roll. I might not use it but I think it should be an option that should be available. Denying this option for the sake of "balance" would be a mistake IMO because:
1) If people want inflate stats, they'll find a way to do it anyway (console, mods)
2) It assumes 5e system is somehow super balanced with rolled stats - let's be honest, 5e is far from balanced. And it doesn't need to be
Having a rolled system will justify letting Larian give companions varied stats (instead of based off of a point buy), which I think gives the characters more personality. This was one feature I always loved about the BG games. Some companions are brutally sub-optimized but that's part of their charm.
