What's not plug and play if using some sensible fde like idk, dm-crypt? You are only a passphrase away from mounting that drive in any other system you plug it into.

That's my question, because my root is encrypted, I move encrypted disks all the time, and have a couple of encrypted external drives. It's trivial.

But I'm sure that some of the millions of things that I've missed as windows has become what it has become makes this simplicity seem like a scifi absurdity. I don't think that they can even log into their own computers without asking Microsoft for permission over the network. I'm sure the idea of encryption must have been overcomplicated to the point of absurdity in order to trap customers too, I just don't know about it.

I suppose you should just count your blessings (of ignorance) and be available to help your friends with cryptsetup if they decide to flee windows.