I don't think a vegan ethics board would necessarily green-light it. There are lots of wild-eyed 30 bananas a day types who would, but I'd guess most people in that position actually believe in the need for b12.

We did not get a definitive study for all-meat. We got a study in two guys, that's it. I lean towards agreement with you that all meat is in all probability fine, but I wouldn't call it definitive. I do think it should be easier to get an all-meat diet with no supplements green-lighted than an all-plant diet with no supplements. Should, not would.