DOS: "One of our commands allows separation of filenames with a + symbol, so we need to prohibit that character." "Couldn't we rework that command to not use +

DOS: "One of our commands allows separation of filenames with a + symbol, so we need to prohibit that character." "Couldn't we rework that command to not use + separators?" "No, far better to take that character out of consideration." Unix: "Filenames can use control characters. I don't care if that makes pipes between commands really complicated! Add an option for NUL-separated filenames if you have to."