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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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.

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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