And even if one can afford Apple hardware, I'd bet on there being significant overlap between the "has keen interest in security" and "likes to fix own hardware

And even if one can afford Apple hardware, I'd bet on there being significant overlap between the "has keen interest in security" and "likes to fix own hardware" crowds. I could easily afford to have an all-Apple household. I don't, because I don't like Apple's attitude towards individuals fixing something rather than buying new.