I am not interested that much in interoperability with Git.
But I am afraid of data corruption, crashes, etc.
Also, Pijul used to have severe performance problems in some situations.
I would call it ready for production if it is stable and performant.
Git interoperability can help with that: if you have an on-disk data format that's either compatible with git, or can easily be converted to git, you can keep your backups in git format, and work from them with git if something goes wrong.