Business cards usually look fine on a laptop screen.
Text suddenly feels cramped. Logos appear oversized. The card fits awkwardly into wallets. What seemed balanced digitally starts feeling visually uncomfortable in real life. This happens constantly in commercial printing.
Most businesses searching for the standard business card size are not simply looking for measurements. They are trying to avoid expensive printing mistakes before placing an order. A few millimetres may sound insignificant on-screen, but in print production, those tiny spacing decisions directly affect readability, professionalism, handling, and brand perception.
That difference matters more than people expect.