I haven't checked but I promise there are Stalker mods that add shitting mechanics
I can't think of any games other than The Sims that have actual shitting mechanics.
Death Stranding has poop grenades. Metal Gear Solid V, your horse can poop, and the poop can spin enemy vehicles.
Oxygen Not Included has toilets and people shitting the floor if they can't get to one. Abiotic Factor has a pooping mini game you have to play when you use the toilet, which is not super often but more so than I'd like.
Final Fantasy
there's 16 of them
There's a lot more than that.