Our disgust towards the smell of faeces must have developed so we don't play with it or eat it, amirite?

Thats how it is with a lot of things. You evolved to not like the taste or smell of things that are bad for you or could kill you. I wouldn't take this too literal though and start eating plants and stuff in the wild that dont taste bad. Thats a good way to get killed too

You might want to ask Amber Heard how she overcame that disgust 😬

There are people that do play with it and eat it though...

Same with overly sour and bitter. According to our instincts, sour means food has gone bad and bitter is poisonous.

That's why work smells sooooo good