And: https://developers.google.com/web/fundamentals/codelabs/your-first-pwapp/

It's not that obvious, there is several aspects to take of, like this ones:

• Webgl
• User input / devices (touch, gestures, mouse, keyboard, etc)
• UX design (not UI, UX is here a real bottleneck)

The links you shared talk about "classic" apps, with no big deal with user inputs manipulation and screen composition.

Scrubs make a great job with this website, may be we can let him some time to see what he can do 😉

I can imagine it won't be easy 😃 but anyway I think it is a way to go to get the Workshop out to as many platforms as possible. It's a great app!