The redundancy of argument parser (possibly its removal) in the class gunicorn.app.wsgiapp.WSGIApplication from file wsgiapp.py about gunicorn HOT 1 OPEN

True, but gunicorn in general lacks a distinction between public API (that downstream users can trust to not go away without notice) and internal (preferably underscore-prefixed) API. This one is rather clearly the former case though, being in the parent class and thus reasonably copied to any custom overrides.

I'd suggest approaching cleaning up such oddities from two separate vectors:

1. add annotation stubs (.pyi) and inline them (after dropping 3.7 compat) and later, so people have an easier time adapting their code using static type checkers
2. internally, prefer keyword arguments wherever copying the full method signature is not desirable - while retaining compatibility with custom code still using positionals, emitting DeprecationWarning

from gunicorn.