zbyte64 gave a great answer. I visualize it like this:

Writing software that does a thing correctly within well defined time and space constraints is nothing like climbing a smooth gradient to a cozy global maximum.

On a good day, it's like hopping on a pogo stick around a spiky, discontinuous, weirdly-connected n-dimensional manifold filled with landmines (for large values of n).

The landmines don't just explode. Sometimes they have unpredictable comedic effects, such as ruining your weekend two months from now.

Evolution is simply the wrong tool for the job.