I think this is interesting, certainly screenshots and giving an idea of how something works is important. It seems more important to many users rather than say developers. I guess developers have a different set of priorities, maybe it does make more sense for users to add screenshots or contribute as it is in their interest whereas maintaining and fixing critical bugs is more within the interest of the developer?

How would this even be communicated effectively to users? I find that most calls to support are vague and maybe if they were broken down by interest or skill set it would help people understand that they too could do something.

E.g. Having a headline that says contribute, and like a table with icons for different professions or areas people could contribute with different processes for each. I have friends who are good typesetters or editors, but they would not put in the effort to use github, they would prefer to use something closer to social media or word/docs at the most. It feels like github samples from only a subset of the population and is actively trying to ensure the comfort and curation of that community to the expense of others and collaborative work in general.