It may seem that way but I'm really not. An encryption key is just data. It's critical security data to be sure but it's still data and like other data you shouldn't share anything that you wouldn't want made public.

Don't want MS to cough up your data when asked? Then don't give it to them. In regards to your BL key that means storing it another way, such as on a jump drive or printing it out.

In the end if you have data of any type that you absolutely DO NOT want made public then you need to retain that data locally. If that means leaving the Microsoft or any other ecosystem then that's the price that needs paid for keeping your data under your control.

This is the foundation of the entire privacy movement.