FDE was available from different vendors (I bought DriveCrypt PlusPack more than 15 yr ago and tried CompuSec (free) more than 10 yr ago, Comodo FDE is around since ~2k8).
So availability of FDE software can hardly be the reason. Neither the credibility of M$, in matters of quality of code as well as especially being an US based company.
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FDE was available from different vendors (I bought DriveCrypt PlusPack more than 15 yr ago and tried CompuSec (free) more than 10 yr ago, Comodo FDE is around since ~2k8). So availability of FDE software can hardly be the reason. Neither the credibility of M$, in matters of quality of code as well as especially being an US based company.