Smart Stay is a Touchwiz feature that detects whether or not you are looking at the screen, and does not switch it off.

The NFC feature is pretty subjective. If one lives in a part of the world where other sectors have not made use of the technology, then it's quite useless in that case.

Similar example - 4G LTE is practically useless for most South Asian, African and South American countries. In fact, I'm fairly sure there are places in the west without 4G LTE connectivity as well.