Rushing to close a deal on a high value asset such as a boat, aircraft, or real estate where the seller insists on actual cash. Granted, you should probably use some form of durable check, but some buyers want actual cash. There are also cultural business habits in some ethnicity/national backgrounds to prefer actual cash over safer bank instruments.

It really doesn't matter: if someone wants to carry a large quantity of cash on a plane, this is still an open society and freedom must be defended.

Wouldn't you withdraw your cash at your destination to avoid the obvious and huge risk of your luggage being lost?

I agree there probably are times that it happens, but it's very unlikely. There are much better examples where the police steal large amounts of cash even when there's an obvious legitimate explanation.

Nope.

You can't just walk into any bank branch you have an account with an expect to withdraw 10s of thousands of dollars without notice.

Also, there are tons of people with online only banks. No physical branches at all!

You'd have to arrange it at a branch. Why would you not pick one at your destination?

I'm not saying it never happens, it's just extremely suss.

I think the idea is that you would need to call ahead to any branch. Why not use one closer to the transaction.