[mwill]

My main display + editor, I use in two modes, 273 columns wide, or up to 410, both of which I feel comfortable with.

I'm guilty! I'll admit, When I know it's my-eyes-only, in languages with functional features, I tend to just brain-dump one liners if I 'see' them in my mind as one sequence of operations. It's easier for me to write, and much easier to read and parse later than multi line equivalent.

But I l also know that outside of private junk, this sort of thing is usually inappropriate, and downright harmful on teams with varying skillsets, where these lines can be impenetrable to some team members, and make the codebase far more intimidating than it needs to be. I segment and format anything above ~80 if anyone else is going to be involved.

So coming from someone who would violate almost any line length rule if no one was looking: I feel like a line length is appropriate in a style guide, or at the bare minimum a consensus on how much is too much.