Locked down devices are kind of the only solution that both (A) preserves privacy and (B) solves the problem. However, it indeed strips a user of the freedom to use their device in the way that they want; although, safe to say that the US doesn't have all that much problem with that, given Apple's continued market dominance.

The alternative is what we're getting right now: laws that require verifying ID documents, often in ways that restrict even the notion of maintaining the user's privacy. Attestation might be an "OK" to "good" solution while this is between bad and really bad.