Why can't OSes have a function that encrypt almost everything when crossing border

Scenario:

1. Before landing, I can lock down my device (phone laptop), which will self unlock with a combination of "duration" + needs to be on a specific IP + specific Geo. I don't have the password so can't unlock
* There is a special unencrypted folder, where I can put non-sensitive data, eg a copy of my passport, my boarding pass, the hotel reservation, etc.
* Alternatively I can whitelist/blacklist different apps to be encrypted or not
2. At …

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