When the iMac first came out, it had a tray CD-ROM. Then the moved onto a slot based while its competitors continue to use tray CD-ROM but they can burn CDs which the iMac could not.
At the time, I remember thinking it was just another move by Apple to offer incremental upgrades. It turned out, as you will read in the book, that was not the case.
Sometimes, Apple, as forward looking as they are, can still screw up.
Back to today and the iPhone. Not having 4" screens. No NFC chip. Keeping Siri only on the iPhone 4S. I don't know. Maybe it could be a calculated move. However, I am not discounting the possibility that Steve Jobs just does not see the 4" screen as right for the iPhone just as he doesn't see a 7" iPad as something viable.
Expecting NFC? Well, Apple has a few patents but we may still not see it. I go to Starbucks a lot and I'm able to make payments with my iPhone. No need for an NFC app.
So, what are reasons for some omissions of features for the iOS devices? Who really knows. Maybe there will be another book about Steve that explains all this or we'll have to wait for one about Tim Cook or Jony Ives. I do know this. Apple is very much fallible. The only thing is that they are heck of a lot more often right than not.
And this is imperfection, a human characteristic, is what makes Apple as a company and story so compelling.