Claude's Code dev here, and I thought I would chime in on this point to clarify why I track it at all.

When I started reading commit data, it became painfully apparent that a very large number of repos are tests, demos, or tutorials. If you have at least 1 star, that excludes most of those - unless you starred it yourself. Having 2 stars excludes the projects that are self-starred.

Starring is also quite common with my friends and colleagues as a way to find repos again later, so there is some use to it, but I agree it's not a perfect indicator of utility or quality.