That's called a support line, and it requires good understanding of the project by non-dev support. That requires to educate someone about your project, and maintain their knowledge to be up to date.
That's not an easy task even in commercial projects with a team of several people, and ability to delegate, and requires a non-trivial skill of leadership.
In other words, the project is very lucky to have such people. And while it sometimes happen organically, it's hard to implement this intentionally.