When was the Newton released and how is that even relevant to today?
OK, lets re-state the point without trying to be flippant: phones got thin and light enough to hold comfortably & fit in pockets years ago. You have to go back practically to the Newton era to find hand-held computing devices that were literally
too thick to hold comfortably - ok, those devices had lots of other shortfalls too, but you're trying to make thin-ness and end in itself. I have a 4-year-old Note 2, still large by phone standards, which is perfectly comfortable to hold, and not too heavy. Certainly not to the point where you'd want to make other design compromises (removing useful ports, constraining the design of the camera lens etc.) for the sake of making it thinner.
An iPhone 6+ or iPad Pro wouldn't be less comfortable to hold if the case were 1mm thicker so that the camera lens could be flush. On the iPhone, which fits into your hand with the centre of gravity in your palm, you could fill that space with battery. Maybe not on the iPad, which you support by the edge, away from the centre of gravity, so the weight is more critical.
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If they go to USB-C loads of people will complain that they've got to buy all their accessories again or use another dongle.
That didn't stop them with the MacBook/MacBook Pro - and in
that case there was no proprietary port to replace, and they could easily have included a mixture of ports if they had wanted to. Also, mass adoption of USB-C as standard in phones & tablets is a dead cert (microUSB is horrible and mobiles only have room for a single connector so a "smart" multipurpose connector is a perfect fit) whereas its not so clear that its the future for PCs.
Currently, what Apple are promoting is at 90 degrees to reality: USB-C is the future for PCs but not for mobile!
However, the time to have made that switch was
with the iPhone 7 - before creating a whole market for Lightning headsets etc.