You're talking about a "local maximum" sustained over half a billion years and trillions of organisms. It's much more likely that this is just optimal for plants.
That's a logical fallacy on its face given the nature of evolution. If there is no pressure to improve then there is no reason for an improvement to take hold, but that in no way implies that a given mechanism is perfected along any access, just good enough.
Exactly - if an infinite number of monkeys sat typing at an infinite number of typewriters, eventually, one would produce the entire works of Shakespeare...
