Because you might be trapped in a cell terrified of Van Eck Phreaking, trying to extact useful data from a set of encrypted 1940s punch cards encoded into text form.
Words cannot express how much this news pleases me. Firstly, it means that there are still people hacking the kernel who are not trying to use it for a political point (The recent debarcle about the non-gpl included firmware binaries springs readily to mind), and of course those people who can read morse will be able to tell when their monitor-less server panics, and why.
Asuming it has a keyboard attached.
As someone commented in the linked doc, it would be more useful if it did this with the power or hard-drive light…