Not so much safety, but it really used to piss me off, we'd have to go up to some radio site, with a "big chain" of padlocks at the gate chain, and usually, the gate is already way up some goat - trail of a road/ hill/ mountain, and there you are ---"your" padlock is locked out of the chain.
I've never understood what is so dammed complicated about putting a lock in a chain so everybody is "in"