Lactose intolerance being a personality trait is just Disrespectful.

Honestly medical conditions would work great as "reward" traits. I'm not saying having a chronic condition is a reward, god no,  I have some myself and would like them gone, but purly within the game's mechanics that would allow you to add minor traits to your sims that don't take away a personality trait slot. I am lactose intolerant but I never use this trait in game because it isn't a personality, yeah, and I'm not giving up one of three trait slots. Now, reward traits can be easily added in game and give small gameplay effects. Most of them are good, but I think the mechanic would absolutely work to add minor traits to sims that make the game harder, too. Let us set sim personality in cas and then hand us a few "reward" traits to further define the characters.

Or, that's probably better than the reward trait idea, make them like quirks for infants/toddlers, but on adults. Minor traits that can be added by the player and/or aquired through gameplay. Quirks could be illnesses, preferences, behaviours not tied to traits etc. 

I mean that they could make it into a separate category for medical conditions, because i have seen people who joke and meme about it as if it were a mental condition, the jokes often involves cruelty or violence against those who have it, which is just sicking.😟

At the same time it's unfair for people who have food allergies (Eggs, fish, ...), pollen/fur/feather/dust mite allergies, Celiac Disease (Gluten-related disorders), ...

And Glucose monitors without Diabetes trait is strange.

Hearing aids and glasses could have traits too, the sims would be clumsy and less efficient when these accessories are missing (implying Career outfit must include them).

I agree it's more health challenges than personality traits so it should be a separate thing.

I could also go all the way back to lactose intolerance. I'm lactose intolerant, and getting that trait in the game, made me feel seen. That was small, but also important to me.

https://www.ea.com/games/the-sims/news/celebrating-25-years-of-the-sims-loel-phelps