I think a perfectly designed being would not require killing to live, would run on sunlight or other direct power sources and be steady state or mostly steady state.

If we ever make silicone man that runs on sunlight then I'll say, "ah, this looks like a being created by a moral intelligent designer".

It's going to be pretty revealing when a creature with such "lowborne morals" as ourselves creates a being that can function and operate without the explicit need to kill something every ~7 days to survive.

I would argue human beings don't need to kill to live right this moment.

But yes, there are a million ways in which the human biology is imperfect.

If our bodies are temples, then whoever made us is probably Nurgle. Nothing else really explains the reproductive organs sharing space with the waste removal ports.