Especially if you're using a finite pool of CI runners. Lots of companies do run their own CI runners either for added security, or to get persistent CI machine

Especially if you're using a finite pool of CI runners. Lots of companies do run their own CI runners either for added security, or to get persistent CI machines with a hot local cache so builds/tests are much faster. Then everyone's PRs are blocked waiting for CI machines just because of people's weird push workflows or micro stacked PRs