If someone is good enough to snipe for that long and not get demolished by everyone looking for them, they deserve to be allowed to snipe. I've seen people who can literally hit the zoom button and as soon as they can see again you're right in their sights and you die, like that. It's just amazing how good people can get at this
It really is more difficult that expected, because unlike using shotguns or machine guns or things like that, you need to make sure you AVOID the enemy to the point that if they're too close, you're pretty much done
Removing that would make it a run around shoot 'em up fest...and no one wants a bunch of pricks running around like that