I know it's silly, but one of my favourite things was to sit and roll characters in BG until I had a stat pool of 90+, lol.
Not 90, but it is unlikely that people didn't at least max their main stat and CON, since it was so easy to do. BG allowed you to sum your scores and reallocate them.
In BG3 I think they'll follow the PHB and roll 6 fixed scores that you them allocate into stats.