Most people take it for granted that they need a bank to do anything, and they don't really consider how powerless they are over their own money. Like how it's illegal to carry too much cash (and it can simply be taken away). And how your bank can impose arbitrary restrictions against you like rejecting transactions and freezing your account. I've lost various bank accounts over the years as a permanent traveler. I'm banned from Paypal.
I want to be able to send $100 cash digitally with the operational minimalism of giving someone $100 cash in person. I want some control over my money even when I want to exchange it digitally.