It could be "dangerous" even sometimes if you're not paying attention. In JS/TS "||" operator evaluates the right side when the left side is "falsy". "Falsy" doesn't mean only null/undefined, but also "", 0, NaN, and... well... false. So if you make a method like "isUserActive" or "getAccountBalance" and do a throw like that, you'll get an error for valid use cases.