I get this whole skepticism thing, but Microsoft has been backing up BitLocker keys in OneDrive since at least Windows 8.

I have personally used the feature several times to recover my drive keys.

There's no evidence here that Microsoft has installed a "back door" for the FBI.

Would you assume that they haven't and trust your secrets to that assumption?

And what secrets are those? If you think that you are secure because you don't use bitlocker or windows AND THAT'S ALL that you do...you aren't secure, you just have bad UI.

I might be blind, but where was that assertion made?

I might just be tired of hearing the same arguments over and over, but it I did see the assertion that BitLocker shouldn't be used to keep your "secrets". As if the choice of which drive encryption software you use on your laptop should be your primary concern when securing yourself against an adversary. (The primary concern is to thoroughly evaluate your adversary and look at your available options for opsec and InfoSec. Maybe you need drive encryption. Maybe you need burners. Maybe you should only use public terminals. Etc. It also means seriously asking yourself if you actually have an adversary or just like to think that you might some day.)

Just sort of saying..."How can you trust MS NOT to have backdoored bitlocker just use Linux. Suck it NSA." Won't actually make you secure.

Right but 'they reached too far during Windows 8' isn't an argument for reaching too far on Windows 10 (plus, Windows 8 really wasn't that long ago so it's still a pretty new policy).