Nodding along with everything you wrote here, but one minor point for anyone who might read the bylaws and get confused. https://www.python.org/psf/bylaws/

> Section 5.15. Limits on Co-affiliation of Board Members. No more than one quarter (1/4) of the members of the Board of Directors may share a common affiliation as defined in Section 5.14.

The PSF allows three board members to share an affiliation, 13 seats * 0.25 ~= 3.25.

BTH, that's one too many, and I helped write/recommend the original language. When I was on the board, three felt like too many, even though everyone was wonderful, and it was Google, not Microsoft, that hit the limit.

The DSF (Django Software Foundation) recently adopted a two-person limit, which I recommend more boards consider.