How do you make peace with the randomly generated sims?

I'm not bothered about townie sims appearance or fashion, but about the fact that they get generated at all. Doesn't matter what you look like, dear pixel, you're stealing the spotlight from my ~100 curated custom townies, who could have appeared instead of you. 
I tend to go on deletion sprees either at the end or the beginning of a game session.

I am still trying to learn to live with this. I made a good amount of Spellcaster NPCs to minimize/stop them generating when I got to the Magic Realm (this really helped). I tried to download extra Maxis produced Households for not in world NPCs but still the auto generation madness won't stop.

I feel bad because my game seems to be stuck in 3 types of favoured auto generation preferences. Asian looking dominating facial features (which I do not mind having Asian looking Sims, in fact some of my favourite NPCs I have saved were saved from original auto generated ones, I just re-dressed), dark skinned with blonde/red hair (and not fashion looking, like uncomplimentary contrast/colour clashing) and extremely overweight/obese Sims (I do not mind occasional curvy or even overweight, but obese bothers me though, I mean the Sims do not have anorexic Sims (thank gawd!) as that is mental illness, but extreme obesity is also a mental illness, and just as triggering.

That is just the aesthetics, don't even get me started on the fashion clashing and accessory abuse!

I do not want to download a mod (especially script based, tuning mods are not such an issue) to fix something as large of scale as auto generation, as it seems just as much as an upkeep, and potential to break the game in an update.

I just wish the devs would update NPC generation pools where we can do it at the manage/edit world level, like marking an NPC a maid, mailperson, firefighter, bar tender, etc. And if we do not assign, it will be auto generated.

I have finally left them in the unplayed area with neighborhood stories disabled.  Thankfully, it has worked so far. I am playing in a royalty save, playing only one family right now.