Its close. Can web apps provide compelling experience , yes. Can provide a full experience, no. Issues - 1. Lack of native push notification 2. No easy/convenient way to add to home screen for average user (possible but not mainstream.) 3. Lack of consistent way to upload photos / videos (this has gotten better though and might even be the same - I haven't used any web apps lately that required). 4. Sure they want to add chat at some point which tends to require the first 3 to do fully (http://www.lukew.com/ff/entry.asp?1696).

I do agree Steemit should be able to go quite a ways before needed an app.