Yes of course if you're running a business then you're getting users logged in ASAP. There are other models of software development, however. Even if you're in the commercial sector, some users may be less eager than others to sign up for your fine service. Should you preemptively suck in their data, whoops I mean back up their data, without telling them? It seems there could be several responses to that question...

It's fine that Apple don't want to support this valid mode of app distribution and use. It is a valid mode, however.