I've got to say, I'm quite happy with the default line length in Black.

The reason I always fight with people who want to increase line length is that they generally want to increase it to 100. Which is just a bit too big to fit two columns comfortably side by side at a reasonable size on a laptop screen, or three columns side by side on a wide desktop screen, which is how I generally set up my editors.

I'm always frustrated with codebases that use a 100 character standard, since I'm always running into lines that wrap, but when I use type annotations, 80 characters causes too many function signatures to have to wrap.