Why do you think is good? just the existence of seed phrase sharing functionality, even if encrypted, significantly expands the potential of a hack

it is not, the backdoor exists — "allowing" using the backdoor is opt-in

which means that I'd they decide not to ask you and break the law (or not break the law in case of a state agent), they can

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this attack from xkcd does not work without physical access to the body

you are free to flee and you can leave the ledger behind safely

but if it has this backdoor, a state agent can utilize it even without your physical presence

hell, they don't even need to have physical access to your ledger with this backdoor

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this is the key point — *even before this update*

don't doubt, statistically, can be evil = will trun evil in case of companies

Software update without resetting the key is always a potential backdoor, even before this update. But I doubt if this update give them the ability to extract the key if user did not opt in.