I'm really curious to hear more about what kind of thing is covered in your playbooks. I've often heard and read about the value of playbooks, but I've yet to see it bear fruit in practice. My main work these past few years has been in platform engineering, and so I've also been involved in quite a few incidents over that time, and the only standardized action I can think of that has been relevant over that time is comparing SLIs between application versions and rolling back to a previous version if the newer version is failing. Beyond that, it's always been some new failure mode where the resolution wouldn't have been documented because it's never happened before.
On the investigation side of things I can definitely see how an AI driven troubleshooting process could be valuable. Lots of developers are lacking debugging skills, so an AI driven process that looks at the relevant metrics and logs and can reason around what the next line of inquiry should be could definitely speed things up.