> So why the hell do they ask for it then.

I suppose so they can do a boot test post-repair or something like that. I have only used their repair process like twice in my life and both times I've just automatically said "no" and didn't bother asking the question. :)

With Apple FDE, you get nowhere without the password. The boot process doesn't pass go. Which catches people out when they reboot a headless Mac, the password comes before, not after boot even if the GUI experience makes you feel otherwise.