alt Hacker NewsThis is optimistic, I see "The cryonics people make a mistake in freezing you (how do we know they don't make lots of mistakes?)"[0] and "The current cryonics process is insufficient to preserve everything"[0] resulting of a product 10% already, seemingly matching the questionnaire as well as possible. They say "under ideal conditions" in the survey, so maybe that rules out cracking of brain tissue or ice growth, but that's not the number practitioners want to know about.
[0]: https://www.jefftk.com/p/breaking-down-cryonics-probabilitie... “Principles of Cryopreservation by Vitrification” https://gwern.net/doc/biology/2015-fahy.pdf
...I'm not sure what this is supposed to mean. Asking about ideal conditions is a reasonable starting point for establishing a baseline, and high-quality preservation is definitely something that can be achieved under laboratory conditions with animal models (e.g. https://www.sciencedirect.com/science/article/pii/S001122401...)