Why is EncryptionMethod tied to a KeyDescriptor?

[Cantor, Scott]

>    Random question for which I presume the answer is "legacy due to
> XML Encryption", but is there a particular reason why DigestMethod and
> SigningMethod are defined for a provider at the top level while
> EncryptionMethod is tied to the key?

Legacy due to Liberty. EncryptionMethod was there originally, the others were defined by me later. I debated, I should have just deprecated the original and replaced it.

-- Scott