But what about somebody like MY DAD, he hears about linux from the guys at work, decides to try it on his new, factory-built Windows PC? Where does this leave him?
I say this not euphemistically, I love my dad but he's a putz around computers, but I could easily imagine him and people like him attempting this. They'd basically be locked out, or screwed.
You worry about your dad needing to change one BIOS setting, but expect him to set up a dual boot environment to try Linux out? Or blow away Windows to install Linux? Huh.
As to where does this leave your dad? He should probably run Linux within a virtual machine on his new Windows PC. No mess, no fuss. Seriously, I've stopped dual booting systems years ago...with modern VT-enabled chips, virtualization is sooooooooooo much of a superior approach.
Saliva causes cancer, but only if swallowed in small amounts over a long period of time. -- George Carlin