It's not difficult to "escape" - using `git checkout` will tear everything down properly - that's the only task of the `post-checkout` - to determine that you want to go back to using vanilla git commit tooling and remove our shims.
We also don't have a prepare-commit-msg hook - our commit tooling will inject an extra Change-Id header (of the same format and interchangeable with Jujutsu) but that affects nothing that vanilla git cares about.