I would be interested to see the case law that backs your claim.

As an example, if I give a broker stock and then ask for it back, they have to give me the stock back, not the cash value at the time I handed it to them.

Also, I'd like to see what law you have in mind when you say ETH is not a currency. Is there some special legal recognition for "real" currencies? If so, what law specifically distinguishes them?