[refurb]

Another factor to layer on as well!

As humans developed, evolution didn't have to create the optimal system, just a system that gets the organism to reproductive years. After that? Irrelevant.

That could point to the challenge of fixing diseases of aging. A good analogy is programming - if the program you came up with uses 8 bit variables, and that limitation causes problems later, well, you're going to have to start from scratch to fix it.