There are so many small and medium sized projects on Github, where you have no idea if they are maintained or not. Sometimes there are projects which are alive and kicking with multiple pull requests, maintainers promising changes or a major release and suddenly nothing. Sometimes smaller projects see no changes for months, but they simply work and don't need maintenance at all. Maybe the community moved elsewhere and and the project will only see bugfixes coming in and no more features?
The burden of figuring this all out lies with the visitor and is a annoying hassle.
I would love if Github could somehow show me on the landing page, if the project is worth investing time in. Maybe they could send a heartbeat to the maintainer and simply show the project as dead as soon as there is no response?