I see your point, and I repeat I'm not arguing with you, I don't have the knowledge you clearly do, but onion layer security is I guess useful when mistakes are

I see your point, and I repeat I'm not arguing with you, I don't have the knowledge you clearly do, but onion layer security is I guess useful when mistakes are made - > Lets say you create a encrypted LUKS partition with a 32 character password. Would it be [...] Quite so, but if someone does a booboo and uses a 3 character password for one of them (well, imagine more sophisticated form of such a mistake) then the extra layers become valuable. I guess it's about guarding against dumbness or accidents rather than correctly implemented best practice.