It would be because he over promised and under delivered.
Sure, it was embarrassing to Apple to release a half-assed Maps app, but even more so to tout it just a few weeks earlier as being soooo good.
And alledgedly refused to own up to it.
Was he pushed to do Maps, and he told everyone it was going to be a nightmare, and then made the best of a bad situation?
It would be because he over promised and under delivered.
Sure, it was embarrassing to Apple to release a half-assed Maps app, but even more so to tout it just a few weeks earlier as being soooo good.