[m-i-l]

> "our legs, they would be much more efficient if the knees pointed backwards. They are not the most efficient design, but simply good enough."

I don't think you can say one leg type is better than another without reference to the intended use of the leg - plantigrade legs have better "stability and weight-bearing ability"[0], whereas digitigrade legs (like those of cats and most birds, which BTW appear to have a reverse knee but don't because it is the ankle working like a second backwards knee) "move more quickly and quietly"[1].

Tying this back to the original point, the same is true for brains and computers - they are each better in very specialist cases within specific constraints.

[0] https://en.wikipedia.org/wiki/Plantigrade

[1] https://en.wikipedia.org/wiki/Digitigrade