15 years ago I might've agreed with this. The current project I'm working on checks many of OP's boxes: Black, isort, flake8, mypy (although even with a strict

15 years ago I might've agreed with this. The current project I'm working on checks many of OP's boxes: Black, isort, flake8, mypy (although even with a strict configuration we've not had to use generic types yet), pre-commit linting hook, CI, Poetry (because Pipenv was too painful and screw pip's hatred for checksums) and pytest. And by the sound of it, OP would be more than happy to get rid of mandatory code reviews and near-100% code coverage. But the devs are happy, more importantly the client is really happy, and after two years we're still moving fast, merging several features most days with minimal regressions. Screw the old way. It sucked.