In my opinion, every manufacturer of a programmable device should not be allowed to prevent the buyer from reprogramming it.
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If I get your FIDO2 token and reprogram it without somehow also wiping the data on it, your problem is that I got your FIDO2 token, not that I could reprogram it without erasing it (which theoretically could perhaps be true right now)
For this exact reason, I store my cryptographic keys in a ring which I never remove from my finger.