I'm adding another idea to the list. It has to do with export scripts. If Tumult Hype is not adding Progressive Web App exporting, then that's not necessarily a problem — if Hype adds the ability to get a list of files / resources.
Do you remember this… Allow Desktop PWA's - #36 by Photics
…well, I did eventually learn how to create Progressive Web Apps from a Hype project. That was a good feeling. I'm surprised it's not a native feature in Hype already. But if Tumult doesn't want the tech support issues, then adding the option to get the resource list while exporting is a nice compromise.
I'm not exactly sure how that would work though, as it's been a while since I've played with JXA. But I'm thinking, somehow the data needs to be retrievable when the script is running, and then a custom manifest.json, service worker, and index.html file could be created.