Yet there is more potential to camouflage than just the initial element of surprise. How often is it used to disengage from combat? A strike, displace and strike again strategy would require the party to reacquire their target. Camouflage can help when running away by reducing the distance before visual contact is lost. Camouflage becomes an important element in an encounter when engaging at long distance; be this arrows or magic in a fantasy setting or long range weapons in a modern or futuristic game. You can't shoot a target you can't see. Obviously the players can always do this:
Extremely inefficient in regards to ammo and also has the drawback of giving away your position.
How comfortable would you be if a game depended only on the hiding and spotting roll? Get seen and it's game over. How much would a game change if spotting and camouflage became a central element in an encounter instead of a modifier during the first round's initiative roll? How would this influence your perception of skill and proficiency when such skills work side by side with hit points to keep your character alive?