At least for me this site is completely broken on mobile. I'm not saying it's not possible to write sites for mobile using this tech... But it's not a great advert at all.

I haven't tried it on mobile. That could be, but my point was limited to latency and programming model.

You can use JavaFX to make mobile apps. So it's likely just that the authors haven't bothered to do a mobile friendly version.

Hardly a surprise, given that:

> The entire thing is a JavaFX app (i.e. desktop app)

Besides, this discussion is not about whether or not a site is mobile-friendly.