Wouldn't Darwinian processes produce "just barely good enough" solutions? i.e. once you're at the stage where things are good enough to survive long enough to

Wouldn't Darwinian processes produce "just barely good enough" solutions? i.e. once you're at the stage where things are good enough to survive long enough to reproduce, evolution doesn't play much of a role. A great example of this is me; I'm pretty amazing; I can move around my environment, make a living to a sufficient degree to cover costs of food and shelter, and somehow even have a fiancée and manage to keep another organism alive & fed. However I'm not an expert at everything, I'm pretty bad at most sporting based things (even compared to other, existing humans; not some theoretical concept of perfection), and I spend about a third of my life doing nothing (sleeping), despite this not necessarily being required (e.g. Dolphins can sleep half their brain at a time, allowing them to avoid this inefficient downtime).