In addition to what MrNomNom mentioned, there is a plethora of evidence showing really poor battery performance for 4G devices; the current generation of 4G chipsets are very power hungry. Tim Cook alluded earlier this year to this shortcoming as a "design compromise" that Apple was not willing to make.There were no 4.x" Android phones yet, thus staying at 3.5" was not such a big deal (nor were there LTE or NFC Android phones). The main points of criticism of the iPhone 4s that are backed up by arguments (ie, excluding those that say it should look different for the sake of being different) are exactly these:
Of course whether these are really important points in the market is another question.
- No 4.x" screen
- No LTE
- No NFC
Concerning NFC, the adoption of this technology on a global basis has been hampered by the inability of various agencies and organizations to settle on a single standard.
The Japanese already have FeliCa, why would they move to something unproven? The US has nothing. Heck, I can't even pay for SF parking with my Clipper Card. Gee, let me try my Clipper Card on the NYC subway system and let's see how well that works.