"in case someone reading will actually at some point need to prepare for such threat" You mean like any human rights organizations who send people to authorita

"in case someone reading will actually at some point need to prepare for such threat" You mean like any human rights organizations who send people to authoritarian states ? You mean like any Foreign Ministry sending a courier out in the world ? You could learn so much about operational security, if you wanted to, just by reading open sources. Can I recommend you start with a wonderful old article called "A first tour like no other" ? If your adversary model is a wild-eyed gun-slinging mid-west racists and you are black, then encryption is not going to be a factor in your death, and speculating what you can or cannot convince them about is besides the point. If a sane adversary has captured you and your devices, say border police in some police-state like Belarus, Brazil or USA, it would be silly to assume that you know more about disk-encryption than they do. Most importantly, you would be very silly to assume that they will not simply lock you up, until you provide access to the device, aka "XKCD538-lite". There are people who have languished in hell-hole jails for years already, not because they are unwilling to provide access, but because they cannot provide access, but are unable make a convincing showing of that. Competent organizations make sure their travelers can make that showing convincingly, and one of the steps they take, is to make 100% sure there is no unexplained high-entropy data on their devices. Imagine ending up in a foreign jail for years, just because you once deleted a huge gzip'ed file, and the first sectors subsequently got overwritten ? Yeah, that happened: "Now decrypt this other secret partition!"