I'd say It depends how complete you think modern neuroscience is. If you think neuroscience is fairly complete and there won't be many gotcha's about how things work then I would adopt your view.

The less complete it is, and the more known unknowns and unknown unknowns there might be before we get a full understanding the more chance that one of those unknowns will interact with the vitrification fluid or how quickly we manage to get people vitrified at the moment (we might not be being quick enough to preserve some chemical structures).

I half jokingly compared it to alchemy in the pre-chemistry days, they had so many unknown unknowns people couldn't find convincing arguments against it. Should they have expected it to work? That is an extreme example though, I think we have a better handle of the brain than the alchemists did of the possibilities of transmuting lead to gold.