We can debate whether it would be overwhelming for every fork to notify its origin. But it would certainly be overwhelming for every edit of a forked page to notify.
But suppose I fork Happening Folks in order to tweak my bio there. I think now it is up to Mike to patrol that page, look for newer versions, compare differences, and assimilate changes. That's a big burden. If I do tweak my bio on a fork of Happening Folks, I'd like a mechanism to ask Mike to merge that change. In the world of GitHub that is called a Pull Request, and it's a fundamental part of workflow in that environment.