I've connected with the primary author of the Microsoft supplied pandas typing stubs (https://github.com/microsoft/python-type-stubs/tree/main/pandas) and the primary maintainers of the pandas-stubs package (https://github.com/VirtusLab/pandas-stubs) and due to the holidays and their schedules, we will meet in the new year on Friday, January 7, 2022, Noon Eastern Time, 5PM UTC.  The meeting has been added to the pandas development calendar visible at https://pandas.pydata.org/docs/development/meeting.html