Because one less is better for things like patches, which require exactly one character more than the actual source code.
We've already established that the value 100 isn't based on a 100-column terminal, but instead on just being a nice round number that's not too high (although again, personally, I'd prefer 120). Using 101 columns in a patch is no more problematic than using 100 columns in source code.
Well, I mean there is the argument that 100 columns fits well in sites like GitHub, but people don't post raw patches as code blocks on GitHub anyway.
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