In my case, since my rifle will see competition use more than anything else (aside from range plinking), the idea is if I ever discover that something got loose, or damaged, and I realize I've lost the scope's zero and can't hit what I'm aiming at, I can grab my little torx tool and pull the whole thing off in 10 seconds.
You know that adding 10sec + to your time, you might as well pack it up...
Id have about the same luck seeing a 400yrd target trough irons as I would through a damaged scope. Eyes are not what they used to be.