So you know what is a mission and its objectives and how it translates to the search for the water chip.
Doesn't mean it should be literally implemented. People have to shit in real life but I don't see a toilet perk or endurance increasing my resistance to peeing my pants.
It made me laught, but also it let me ask myself if you are serious. Who- Where- What- and When are the important parameters and are always necessary. In most RPGs we are not used to a time constraints, because most of the games want us to explore planless the world. But the more thoughtfull storyheavy RPGs assume a over time changeing enviroment that you influence throught you acting and since you cannot be everywhere at the same time you can only change certain things in a specific direction that you decide as important to you. WL2 had the the 2 choices as a visualisation of ths concept. The Witcher 3 and now KCD have embraced the time constraint as a important part of a game CP77 will be also this way.
BTW. (not so serious): About the body functions. I also watch animes and one of the most funny elements of Naruto is as he has to run to the toilet, because he drank spoiled milk. Perhaps it would be also a good moment, if you have to ask a red dragon if he could wait a minute, because you have to go to the toilet?