Sealing sounds like the threat model for the nk3 is rather a moderate adversary that would have trouble gaining physical access to the chip without destroying it. The question is if there are measures that also protect against adversaries with significant resources. Or to ask differently: Would you be confident that all secrets (Fido2 key, Pin, gpg and ssh key) would stay confidential, even if your nitrokey 3 was confiscated by authorities e.g. US border control, NSA, FSB ... Would you recommend the NK3 to be used by activists in Iran who would not survive if any secrets can be extracted (assuming there are no unknown vulnerabilities present)