Well technically when there are certain animals around. They poop āManureā. Which I think has a practical application in game terms to re-use. But I want the option of humans peeing and pooping.
I think there is all manner of great moments to be had in such options. Fear effects. Reactions. Having to take care of business at moments you just cannot do such things and it makes doing search runs pretty interesting to have to deal with body functions. The funny and scary moments when you have to pee or poop and you got zeds bashing down a door lol