Also it's important to note that Microsoft doesn't have your key it has a key recovery element they still need the TPM and your physical drive to recover the full key this is a very very important part as they 1) still need physical access to your machine and 2) cannot arbitrarily encrypt data on your behalf.
FDE isn't there to stop government surveillance it's to stop your life from being ruined because you forgot your laptop at a coffee shop or because the guy who you gave your laptop for repairs is a watcher.
FDE's biggest problem is that it can fail very easily and very miserably especially when anti-tampering is enabled with external hardware. This solution solves all the usability issues as long as you can get online your laptop will not turn into a paper weight, I can't count the number of times that BitLocker especially 1.0 failed on me when the anti tampering was triggered due to power failure, BIOS update, boot loader reconfiguration and just because it can. With this you get to keep all the anti tampering while still keeping your key relatively secure, OneDrive is probably more secure than pretty much any location you would normal keep the key recovery element yourself (Mine was both my wallet and a scrambled version under the battery when i still have laptops with removable battery).
P.S. This is like the 10000's time this has been posted every time some one else discovers this and goes for the clickbait.