Yes, I think many people use GitHub just for code storage, and that's fine.

I casually browse GitHub sometimes in the same way I do HN. I follow friends and colleagues and through the feed see what they're building and starring. I use global search to find tools and libraries that do what I want.

Sometimes, I come across a repo I like that's on say GitLab, but not GitHub. I quickly forget about such projects because they live in my bookmarks instead of my stars list.

>I find the social tools on GitHub like PR reviews, issue management, and notifications

I don't consider these social features, at least not in the way I'm talking about.

If nobody was using GitHub you'd be forced to get used to bookmarks, and that would be good.