zlacker

"I think the point is rather that single-codebase "productivity apps" that satisfy basic modern experience expectations (like "I could run it offline") are not possible elsewhere - but they should be."

Why?

"Also, the thing about expanding the Open Web Platform is that the new features that are available to me don't take anything away from you if you don't want to use them. "

As a user, they do. If you go whole hog on the PWA stuff, then I no longer have the regular website you used to have.