I agree. There is a lot of information out there from which we can take. But with the particular “grassroots culture and dynamics” I was referring to something that (a quick browsing through) the resources you provided do not address.

I think lowering the threshold for becoming a member , and therefore gaining power that allows you to influence the organisation by voting on decisions and the people in the board of directors (elected leaders) is the best option, iirc codeberg has a “everybody can be a member as long the they contribute some money”, a more famous example is American Association for the Advancement of Science, unions and cooperatives and cooperative banks (another example is vanguard) also work in a similar way.

an archarchist and post-(hyper)capitalism streak on the Fediverse (though The Muskening brought change to the culture), and a general weakness I perceive in the FOSS movement as a whole.

You could come up with reasonable arguments against any system of governance i think, like Winston Churchill said: “democracy is the worst form of government – except for all the others that have been tried.”