[Serious] Why defecation?

[Gawdzilla Sama]

I don’t think the question is whether it’s ‘good’ system, but why a god with the ability to do otherwise would create such a system at all. It would have been just as easy for an omnipotent creator to set up a system in which all organisms would be 100% efficient and not need to excrete at all.

Boru

Millions of tons of pollutants generated every year is not a 'good' system.