Just because you can provision Felica cards outside of Japan doesn't mean that you can actually use them. It's not really global support if you can add Suica in the US and then not use it. More likely is that Felica Networks agreed with this logic and Apple is only paying the license fee for JP devices, or has some side deal about not delineating between regions. If Apple didn't support Felica, it would just move more users in Japan onto physical cards or Android.
On recent US SKU iPhones — don’t know how recent —- you can add a Suica card directly to Apple Wallet annd use it anywhere the physical card is accepted. No weird regional deals.
