GitHub is adding more permission levels! You can now give people the power to close issues without giving commit rights: https://github.blog/changelog/2019-05-23-triage-and-maintain-roles-beta/
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It's weird that GitHub shows time since the last commit, but not time since the first commit. It's a nice way of seeing how mature a project is.
TIL Drupal has a credit system to give preferential treatment to people and organisations who contribute regularly! https://dri.es/solving-the-maker-taker-problem
It feels like a mature software project is one where bugs require multiple commits to fix.
You've hammered out the basic issues, so the remaining issues are often weird interactions between components.