I have tended to edit my townies lately. (I'm also sometimes turning aging off while I rotationally play so Sims are around for a while). I just recently got CL and haven't noticed this. I did go to Alien Night at a bar and then had a whole bunch of aliens flood the game. All my street carts were run by aliens and that was really annoying me.
I welcome the great diversity in the game. Most of my townies are diverse, I just try to make them fairly realistic and to avoid walking fashion disasters. I edit out the crazy mohawks. I have left a few of them a bit weirder but I try to give most of them flattering outfits and style. If I were seeing a bunch of very similar-looking townies, I might edit some of them and make them more varied. I make up back stories for some of the townies who show up a lot. I do like being able to have Sims in the game who are reflective of broader cultures.