It’s hard to tell exactly how typeform works, but I imagine form-entry-as-a-service would not work in offline settings. The tricky problem I was referring to is discussed here. Basically, how do we decide on a schema for communicating form metadata from the server to the client (and form data back)? Then, how can we keep the current mechanism of implementers being able to easily create new forms as they have been able to do up to now.
In my opinion, form presentation should be up to the app developer, although we could provide html fragments and styles for the RefApp as discussed here.