The only time I look at the actual web interface for bitbucket or github is during PR reviews. Otherwise I'm either using the respective desktop app or grabbing blames from my editor. So, I'm always locally browsing branches.
So realistically, only Commit (under Browsing Git repositories) and Code review actually matter. Lighthouse metrics don't matter much at that point (if I'm at the PR stage I will put up with an unusual delay to get the PR through).
I think that's what you're seeing with these metrics.
Dev's don't care about a repo's browser experience. They care about the terminal/desktop-app experience.
So realistically, only Commit (under Browsing Git repositories) and Code review actually matter. Lighthouse metrics don't matter much at that point (if I'm at the PR stage I will put up with an unusual delay to get the PR through).
I think that's what you're seeing with these metrics. Dev's don't care about a repo's browser experience. They care about the terminal/desktop-app experience.