I have just started using it and love it. It sounds funny but while formatting is not always a deal breaker it still kills me for 1) readability and 2) the faith that when someone reads the code base later one they know I was not an idiot.

I know 2 is kind of subjective but when I look at someone elses code and I see obvious mistakes against pep8 I start judging both the person and the code harshly. Perhaps unfair but for the very simple pep8 rules I see it as someone who is not as well versed in Python and perhaps does not care about their code as much.

Overall I just concede that consistency is better than everyones personal tastes. For a startup I think you can get by with just some custom linting but in a larger org I find it much harder to agree on a consistent format unless you are a Python first org. Much easier just to roll Black into the project and go with it.