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Yes its a serious question...and why not. Because my camera is functioning fine without it. How, is this possible? And if I knew the full function of a camera shutter I would fix it myself.
Here's the thing. The assumption that your camera is working fine without the blade is based on your limited observations. You can only tell that the exposure appears correct. You don't know if your shutter has suffered some other kind of damage as a result of the initial failure or your subsequent removal of the blade. Your response is a bit like seeing a bolt or washer fall out from your car, and since your car doesn't seem to be any worse off, you shrug it off and think "oh well it couldn't have been THAT important." Meanwhile something has come loose and a few months later you have a catastrophic failure.
So to be clear, there are NO extraneous components in a camera shutter. None. If it was there when they built it, it was there for a very, very good reason. It's a shutter blade, not a stick of gum from a 5-pack.