NFC: one of the problems is that there are no radio passing translation between the GNU/Linux layer in Sailfish X and the Android layer inside the AlienDalvik compatibility (there are currently no BlueDroid inside AlienDalvik). So even if NFC get better supported inside Sailfish X, most of the Android applications won't be able to use it yet. You'll be stuck with the few native Sailfish application that make use of it (so initially mostly "Other-Half" -like NFC chip detection). Forget about NFC payment initially (the payment processors won't open their protocols to let some 3rd party make a free/libre open-source app on github, and the official apps from the payment processors won't work neither).