I know the pitch and the current practices of cryonics #1. What you said is not new factual information for me, but the way you present it surely helps to understand your point of view.

It is just that with cryonics #2 we can know whether we are succeeding, and with cryonics #1 we can never be sure (and that's why it can only be applied to dead patients without being considered murder). Personally, I would support legalization of cryonics treatment before natural death - on equal ground with all other forms of assisted suicide (with same informed consent requirements - some safeguards are needed).

I think that scientific development of cryonics #2 would benefit from explicitly saying that it doesn't know when (and whether) it will be able to offer a verified way to do what cryonics #1 (blindly) tries to do now (maybe succesfully, maybe not - we have no way to find out it yet).