That's correct, if bad guys broke into my home and accessed the book it would have been game over.
Personally I would be much more concerned about other things - my stuff is there, not to mention often myself - but I'm sure that a vast faceless corporation would be primarily concerned with the potential for these hypothetical bad guys to learn and maybe disseminate secret passwords.
How often do you think that actually happens? It's a bit... high risk for opportunistic "cyber criminals" don't you think? Figure out where key employees live, then break in and... look for passwords they've written down and then presumably use them quickly before they're invalidated.
Personally I would be much more concerned about other things - my stuff is there, not to mention often myself - but I'm sure that a vast faceless corporation would be primarily concerned with the potential for these hypothetical bad guys to learn and maybe disseminate secret passwords.
How often do you think that actually happens? It's a bit... high risk for opportunistic "cyber criminals" don't you think? Figure out where key employees live, then break in and... look for passwords they've written down and then presumably use them quickly before they're invalidated.