I can't use cash to transact with anyone on the planet instantly and it has additional unique disadvantages over cryptocurrencies besides that.

I don't think you would ever say everyone should be ok with the government monitoring everything you say and do 24/7, so it's ridiculous to claim people only need private transactions to "buy drugs online". It's a strawman of the actual issues brought by not having private transactions. And it's directly related to seperating the state from money.