The formatter downsides that people have pointed out are real but are far outweighed by the benefit of consistent formatting. Consistent both across your project and from project to project. We all have our preferences on style, but you get used to anything after a while and the consistency is a joy.
On my project, I always ensure that one of my pipeline stages runs the following command:
mix format --check-formatted
This returns a non-zero error code if the formatter would have to change anything to make the code formatted, which keeps our codebase consistent. Team members are then responsible for ensuring that formatting happens as part of their workflow (mostly through format on save in VS Code, but in some cases pre-commit hook, or just remembering).
