I don't think these questions can be answered publicly. I would reach out to your jamf rep to get you more information. I would say in my opinion it is worth the time in being part of the feedback program.
I find it handy to enroll in the Jamf Pro Betas for a few reasons:
Sometimes I don't have enough time to test the beta but at minimum having access to the beta release notes gives me advance notice of what to expect in the near future. I don't see any downside in enrolling.
As was mentioned previously it is never meant to be used with a production network. That said, you can use tools to copy elements of your production network to the beta network that will allow you to do testing that more closely mirrors your production network.
If that doesn't fully answer your questions, maybe provide more insight into why you are asking.