Fur colour gives you camouflage points in certain biomes.
I'm pretty sure you knew this already, though.
Ah, I totally get where you are coming from. Personally though, I don’t find breeding for certain furs for camouflage all that exciting or enticing, especially when you’ve unlocked most of the genes as there are far better, more helpful genes to try and mutate. Not only that, but there are other genes you can get to keep you out of sight from predators such as the +2 stealth from (I believe Silk Paws), or the camouflaged gained from stripes or certain spot patterns. On the other hand, I have personally found it quite difficult to breed high levels of heat resistance with both big ears and lean body being quite difficult to breed into a population (this is from my own personal experience).
Once again, I totally get the point you are making!