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I wonder if the limitation is power. Can a fingerprint scanner be powered by NFC?

OTOH in my specific use case, I only use the NFC with my phone, the USB-C version should take care of that

But would of course depend on the sensor. Zwipe uses a sensor from the Swedish company FPC

Even in that case, NFC is just so much more convenient than USB-C (and you don't have to worry about wear & tear on the connector).