For the vibrations... I do this...
Take a med. range rifle... set up a target, and get to range... aim down your sight, then have someone throw something at the barrel of the gun right as you shot... the mirrors would be superflous in AHII, cause lag, take up space, and lead to complaints of "I couldn't see the plane coming from my 12 o clock High cause the damn mirror was in the way!!"
? I don't follow your analogy, I'm not aiming with my mirror, just watching for movement.
Sure, that's one argument, but there are two sides. Just have the ability to turn 'em off if needed, not as big of a deal as everyone is making about it if you ask me. I prolly wouldn't use 'em, and adding them isn't very high on my list, but why not add it to the "someday" list. No harm there.