Meh. I can live without that until/if cashiers stop taking cards and cash.
I think Apple Pay is more useful than a little bit more RAM. Do you think the presentation would have been better if they skipped the Apple Pay part and just showed "2 GB RAM" on the screen? I'm sure everyone would have been impressed.
I'm not saying more RAM wouldn't be useful. Yesterday I was using my 5s to listen to music while getting directions from maps and checking Facebook while in a car. The maps app kept exiting and stopping the directions. Possibly because it was crashing or maybe it was out of memory.