This is a good article but the author missed the broader CONSUMER/dev consumer mission of Ubuntu. It's sole purpose and number one priority is Usability first followed and shaped by quick deployment as number two. Ultra top tier hardened Security isn't in the top mix. Easy answer. Having said this I'm glad someone is taking a hammer and chisel to it so that it can be a better platform. The same thing can be said of Windows or Mac. Consumer facing off the self platforms simply weren't designed for hardened security.