With Yubico I always get a feeling that if they could breakaway from all this legacy smartcard stuff and lock everyone in, they would. But they can't yet, so they distanced themselves from it and were keeping it on the down-low ever since.

I would really like if they made a wearable without any ports like a NFC ring, but that would mean either keeping it tied to phones only with an app or selling their own NFC/contactless reader, most likely with some proprietary bent.