>> Apple Pay and contactless are both the same technology & same standards. If you support one, it's essentially trivial to support the other
Ah, this I didn't know, thanks.
>> Additionally if you support NFC, it isn't much more to support ICC as well.
It's different hardware. Historically the hardware has been more likely to support ICC/EMV and not NFC, but if the US is actually ever going to do a big EMV rollout then (were I the I the sort of person in charge of buying the equipment) it makes sense to go for both.
I'm sort-of interested in the Apple Pay thing now. (only sort-of, I find payments tech mostly to be incredibly boring). I've not worked on NFC/EMV contactless kernels but I understand that, unlike with the physical chip versions, you tend to need at least some amount of custom code for each card scheme. This has been put down to the schemes not pulling together quite so well this time around.