More active repos don't necessarily have more stars, maybe a better way to sort would be to have main repo followed by number of commits ahead, then number of commits behind. Most often what I find is a repo will have 3-5 dozen forks and the vast majority will either be far behind or have one or two localizations. It is very rare that I find something that someone has really forked and started doing active development on.
I wholeheartedly agree with this. I think it's just a blind spot they have, although back in the day a GitHubber told me it was also about maintaining an agnostic approach to governance.
btw, iirc GitLab does give you the option of sorting by most recent commit.