not being able to submit or review PRs for a day is much less impact than not being able to checkout for a day.

I guess it depends on the definition of done of each team.

We normally can't complete tasks until they are code reviewed, so checking out locally would be the analogous of working offline in a CVCS

You can finish the first task as much as you can, then start on the next one...

The CI/CD pipeline could also be done with a post-receive hook on another remote.