iPhone since 8th gen has had NFC-F / FeliCa support:
FeliCa is a contactless RFID smart card system from Sony in Japan, primarily used in electronic money cards. The name stands for Felicity Card. First utilized in the Octopus card system in Hong Kong, the technology is used in a variety of cards also in countries such as Singapore, Japan, Indonesia, Macau, the Philippines and the United States.
FeliCa's encryption key is dynamically generated each time mutual authentication is performed, preventing fraud such as impersonation.
FeliCa is external...
This is must have feature in Japan, and in other metro areas in SE Asia and US that have adopted it for transit.
I’m sure open source HW advocates will advocate against inclusion of any such HW, but I thought I’d suggest it anyways because it is a deal breaker in adoption in some regions
Why not taking a PinePhone approach of exchangeable back covers offering different add-ons?
PINEPHONE & PINEPHONE PRO PINEDIO LORA ADD-ON CASE - PINE STORE (pine64.com)
PINEPHONE & PINEPHONE PRO FINGERPRINT READER ADD-ON CASE - PINE STORE (pine64.com)
PINEPHONE & PINEPHONE PRO KEYBOARD - PINE STORE (pine64.com)
I could definitely see the sense in stuff like extra battery pack add-on. Yes, the L5 would get crazy thick, but it would be a choice of the user.
And under the same logic there could be a FeliCa add-on case.
Speaking of PinePhone, I ended up making the suggestion there as well since Pine ecosystem already lends well to that: