ad_hoc
(they/them)
Not keen on this. It seems to be the worst of both worlds: those players who like randomness don't really get it, while those players who don't like it seem to be stuck with it. I'd recommend simply offering the arrays, and leave it at that.
This is what I'm worried about.
For me, it would be enough. I want to be forced to play a character with random stats. If I just pick then I will gravitate to the same characters each time. I want some randomness so that I'm inspired to try something new.
What I don't want is a character who is exceptionally good or bad. And as a DM I don't want to have a player or two who have characters that are much better than other's.
Another solution is to have some of the stats you could roll slightly better or worse than point buy. So you could still get lucky and get a better character, just not in an extreme way.