Ha ha, I suppose the waste system could have its own little airlocks, you do your business and out it pops into space.
David Bowman "Open the poo bay doors please HAL"
HAL 9000 "I'm sorry Dave, I can't do that"
David Bowman "Aww shit!"
HAL 9000 "I know Dave, how about a game of chess?"
lol, yeah.
But I was hoping we could optimise the human body to a zero-waste system.
Like we move to zero emission cars we should do similar with humans...I guess.
...I guess I'm just extra lazy. Ever wake up in the morning because you gotta pee but really don't want to get up? It's painful :D
From a utilitarian perspective I get your point, make pee-pee something humans did before they evolved technologically enough to not need to.
However, the loss of such comedic material as the space suit fart, I believe would render humanity a lesser species to be a part of :)
haha, very true!