What isn't a bad thing? Shitty security in BIOS chips? Instead of reformatting your disk you have to detach eeprom chip that holds bios from mobo and connect it to another system to inspect it for infections / changes. I'm not sure this is even possible for most mobos and it doesn't cost nothing like reformatting disk costs nothing.
EDIT:
> using BIOS vulnerabilities will be the only way to install an unsigned operating system.
Then I would rather not use those systems.
Android phones are already at this level - I could run CyanogenMod but I'd have to first run a random blob I refuse run because there is no way to verify what that blob does. I'm screwed both ways. At these moments I remember Stallman wasn't completely crazy and wish Linux was licensed under GPLv3 so that the phone I bought wasn't tivoized.