I guess I am not sure what you mean, it is not a team collaboration across multiple manufactures like AAF is. It was developed by Celemony just like VST was developed by Steinberg but it is fully open for Steinberg to implement and any other company that would like to encorporate this into their DAW. 3rd party apps like Vocalign by SychroArts also benefit from DAW’s implementing this into their software.
So I guess regardless of open or not it would greatly benfit me if Steinberg implemented it.