I think it depends largely on what rules the DM sets up for character creation. I've only ever played with a roll for stat system instead of point buy and the DM I played with allowed two 20 sided dice rolls for every stat and then you could choose the highest out of those two. The games he ran contained a lot more story based role play than fighting and skills often seemed more important than stats. I also haven't played table top D&D since 3.0 / 3.5 so don't have any experience with 5e.
As for dump stats in video games I always do it. I mean, there's some stats that just don't need much of anything depending on what character class you're playing.
