"And to make full use of Continuum, you'd have to shell out for the new Microsoft Display Dock, and would need a monitor, keyboard and mouse handy. That's not a very portable package."
That's a bit of a daft statement. Most of my work colleagues lug around a big laptop (and a smartphone) and what do they do with the laptop when they come into work? Plug it into a docking station with an attached mouse, keyboard and big monitor! Now, if that laptop could be replaced entirely by the smartphone alone, it's a winner.
Regarding user-replaceable batteries: "Apple has sold hundreds of millions of iPhones without them.."
That's because the vast majority of iPhone users probably never considered such a practical thing as battery life. Their iPhone is virtually a religious artefact, and no matter how bad value for money it is The Sign Of The Apple is all that matters. If the battery fails, they'll just spend another fortune on a whole new phone.