The common annoyance of banks not paying interest on checking accounts stems from history. Regulators once prohibited it to ensure bank stability. After the rule was repealed, the interest-free float had become such a large and reliable profit center that banks became structurally reliant on it.

Businesses and financial institutions intentionally accept a certain level of fraud. The friction required to eliminate it entirely would block too many legitimate transactions, ultimately costing more in lost revenue (lower conversion) than the fraud itself. It is a calculated trade-off between security and usability.

The common model of a bank holding your money is wrong. When you deposit cash, you're buying a liability (a debt) from the bank. The cash becomes the bank's asset, and the deposit is their IOU to you, which is transferable.

The value of forgiven credit card debt ($55-60B/year) is a substantial, privately-funded transfer to defaulting consumers. This amount is comparable in scale to major public benefits like food stamps (SNAP at $95B/year), yet it's rarely discussed as a social support mechanism.

The slowness in traditional banking is often intentional, not a sign of outdated technology. These "bugs" are features designed to protect the most vulnerable 5-10% of customers from fraud like romance scams or elder abuse, which is a massive liability for banks.

Unlike in many countries, the standard US bank account is a "checking account," which is fundamentally a credit product. Banks must therefore manage overdraft risk, leading to higher-ceremony onboarding processes and industry blacklists (like ChexSystems) that exclude individuals who have previously caused credit losses.

While convenient, the decline of physical cash risks locking the economy into tech platforms and creating barriers for the unbanked. Cash represents an open, uncontrolled system whose loss has significant societal and class-based downsides, concentrating power in the hands of platform owners.

With many "Buy Now, Pay Later" (BNPL) services not reporting to credit bureaus, lenders face "stacking" risk where consumers take on invisible debt. To get a holistic view, lenders are increasingly incorporating cash flow data, like checking account trends, into their underwriting processes.

The federal government's push to eliminate checks failed because it overlooked their function as a universal, last-mile "API" that reliably reaches nearly everyone, including unbanked individuals and complex legal entities like trusts. Without this fallback, immense bespoke effort is needed to handle countless edge cases, making abolition impractical.