Financial and logistical systems thrive by standardizing a simple, "dumb" core protocol (like a check's format or a street address). This stability allows for complex, intelligent systems to be built on top without breaking the underlying infrastructure, ensuring long-term interoperability and resilience.
Checks are not just payment messages; they are instruments of credit. To make this high-risk system work, the state provides a backstop by criminalizing check fraud ("uttering"), disproportionately punishing the poor for behavior that is treated as a fee-based service for wealthier customers.
To overcome a coordination problem where small banks resisted electronic check processing, the 2003 Check 21 Act didn't seek consensus. It unilaterally declared an electronic reproduction of a check legally identical to the original, while creating a "substitute check" carve-out to accommodate laggards without halting industry-wide progress.
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.
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.