Right, Microsoft have the ability to recover the key, because average people lose their encryption keys and will blame Microsoft if they can't unlock their computer and gain access to their files. BitLocker protects you from someone stealing your computer to gain access to your files, that's it. It's no good in a corporate setting or if you're worried about governments spying on you.

I'm honestly not entirely convinced that disk encryption be enabled by default. How much of a problem was stolen personal laptops really? Corporate machine, sure, but leave the master key with the IT department.