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>Other than crime the only other use-case I've seen for crypto is for getting money into Russia

Violating sanctions is a crime. Given the trend we've seen people should start getting used to being considered criminals.

>What am I missing here? What are the cool things bitcoin does that something like visa cannot?

It's easier to send Bitcoin to people without doxing myself than a visa transfer.

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I've heard that crypto transactions can be more secure but I've also heard that securing information on the blockchain is basically impossible because it is a publicly available ledger. How does bitcoin opsec work exactly?

You just send it through a mixer beforehand. Also securing information is possible on the blockchain, Monero does it.

But we already have "mixers" for normal money. It's called "money laundering". I can't imagine "mixing" remaining legal for much longer.

Legality is irrelevant, as long as it's still viable.

It's anonymous, not private.

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