Oh, yeah, I understand that ReFS support is a use-at-my-own-risk feature.
Honestly, the data on this pool is nowhere near critical. I was just curious whether unnoticeable corruption could occur with balancing enabled, even if the chance is low. It sounds like it comes down to whether the built in API ensures that integrity streams match on copied files. I briefly looked for info about that, but couldn't come up with anything.
Regardless, I'm happy with the current state of DrivePool's ReFS support. Anything that further takes advantage of ReFS capabilities would be a welcome bonus.