There is an odd tendency in the game to choose certain body types which doesn't appear to be random at all. It also happens with CC. I quickly learned that, when downloading a hairstyle, I should always use Sims 4 Studio to make sure that the hair hasn't been tagged as random. Because if it has, almost everyone in town will show up with that particular hair on their heads.
I don't know. I get the feeling that there are problems with randomization in TS4, in general. The game has randomization for clothing, skin tones, hair and such. Still, so many of the outfits roll the same and many of the Sims look alike. Also, no one bothered to make a routine that randomizes aspirations and traits. I miss the ability to roll a Sim's personality on the fly.
