No, AFAIK, all raw formats contain an embedded jpeg.
Yes, and... - s-s-some-b-b-body with chattering teeth, maybe
I usually don't disagree with you, but if I may reply to a begged question: primarily to save space by eliminating some redundancy.
Secondly, if you do lose a raw and are left with a jpeg version it's still not the same thing.
Of course, these are opinings of my own, ie. why I do/don't...