Here is another reason camo matters.

I shot my big buck this year and loaded him up and took him to the home farm where we took him out and took pictures. The neighbors drove by and saw him. Within hours they had a stand as close to mine as they could get it. (they obviously thought I killed the deer there where they saw us taking pictures) When I'm bowhunting the less other people know where I'm at the better.

Also being able to successfully hunt without camo does not prove camo doesn't matter.

People have also killed deer with spears.......That doesn't make them as effective as guns.

They also processed deer with rocks and that doesn't mean knives don't work better.