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Quantum computing is theoretically able to attack many of the public key encryption algorithms we use. Hardware encryption of HDs doesn't use those algorithms, it uses symmetric-key algorithms, that are not vulnerable to quantum attacks.

There are quantum-resistant encryption schemes.

See: https://en.wikipedia.org/wiki/Post-quantum_cryptography

You’ll probably be dead by then anyway.

Some people guard secrets that they think need to stay hidden for more than a lifetime.