Third, even most Linux distros do not explicitly encourage the use of dual-booting, and have a whole system setup including walk-throughs telling you how to do it, built right into the OS.
Could you name just one Linux distro that does not "explicitly encourage " the use of dual-booting. It's not even clear what do you mean by that term, have you actually ever seen a message on any Linux installer that tells you its "dangerous" to load multiple operating systems on one disk. I am asking that because I've seen that laughable message during Windows XP installation. Or have you ever come across a situation where the Linux installer has failed to detect another already-installed third party OS.
This is Slashdot; please don't write down anything unless you have researched it. But yes, some fuckhead has modded you up as "Informative"; so times are changing, even Slashdot readers are not the ones like they used to be.