http://www.reddit.com/r/chromeos/comments/207wlm/is_it_possi...
I can't think of one good reason why a SINGLE keypress at boot can wipe everything and revert to factory settings. Moreover it isn't even password protected.
If you don't reflash the bios and you are dual booting ANYONE can walk over, turn your computer on, press space, and tada your computer is wiped.
This is the screen: http://imgur.com/wMtvgX3 I'd be willing to bet the majority of people would press space faced with that, especially after 15-20s of it sitting there doing nothing. (it sits at that screen for 30s unless you hit Ctrl-D)
The only reason I can think of that anyone would implement something so inane would be to discourage people from dual booting.
edit: I don't disagree that Google has contributed a lot to the Linux community. Overall I'm a pretty big fan of Google and I use a lot of their products. That said I still think their approach to ChromeOS has been very unfriendly towards Linux users. (they're bad vs. what they did was bad)