In reply to @delroth:delroth.net
(and like, normal nixpkgs quality standards aren't high, but for example https://github.com/ngi-nix/ngipkgs/blob/main/pkgs/by-name/freeDiameter/package.nix wouldn't pass...)

From my outsider perspective, "mob programming" is the #1 issue, as I see it as the cause for many of the described symptoms (low efficiency, poor mentoring, poor contributor retention, lack of Nix expertise in group leaders)

I think is fine, as long as someone in the mob is "knowledgable" and able to course correct when needed. But having many people "learn by doing" at the same isn't the most productive.