I wonder why they didn't think of a way to make up for the lack of NFC in the US. It would have surely lead to much higher adoption rates of Apple Pay there.
I think they assumed (somewhat correctly) that NFC would come through terminal upgrades and replacement cycles. MST is a great feature, but it is kind of a legacy technology (and Samsung bought the company that had patents on it). I think for QR-code based services, retailers would still be pushing their own over an Apple-backed one (even now, Kroger and Walmart are trying to make it happen instead of just turning on the NFC capability on their terminals).
Outside of places that have NFC-capable terminals that intentionally disabled (Kroger, Walmart, Sam's Club, Home Depot, etc.), or the places that are still doing magstripe-only (restaurants, old Square readers, some gas pumps), most places have working NFC out of the box with the current generation of terminals. The only other obstacles are places where the terminal should be customer-facing, but they have it tucked away behind a counter and take the card to insert.
At this point, outside of a few bills and the occasional trip to a store that anti-NFC, almost all of my transactions are done with Apple Pay. Every once in awhile, I'll run into a terminal that doesn't like a particular card network via contactless (Subway doesn't seem to like Discover, some other places don't seem to like Mastercard), but another card network works fine (my backup is an Amex). I'm in a decent-sized city in the Midwest, so it's not exactly like our market is always the first to get or voluntarily adopt new tech.
I do think even now, there's a lot of people that haven't even bothered to add their cards to Wallet or try Apple Pay, even though there's plenty of retailers that support NFC.