Wow - looks impressive. Like the direction it's going. Doing things where access policies can be set as code is the way to go IMHO.
One issue I've heard from ZTA early adopters is the lack of interoperability between the various ZTNA solutions. Not a big problem unless you have two organizations that have different solutions that now have to work together (merger, partnership, etc.). Ironically, I have overheard people complain enough that they would pay for a FOSS solution...