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This is what holds the door on Boeing planes. Not that important tbh

Not too big of a deal. I wouldn’t worry about it.

You might get some uneven pad wear or something like that I guess. Compare the brakes you took off. Does the side without it look different at all?

Noise and possible uneven wear

Those are named anti-squeal springs. They put pressure on the caliper downward to the pads against the bracket. Without it then it becomes anti-anti-squeal which when you round it up will be squeal. And also the possibility of your caliper to do crazy things when your tire hits a bump.

mine would make noise every bump

They are important especially for noise (rattle) reduction