What common mistake do developers make with Route organization, why does the mistake cause problems, and what is the safer approach?

What common mistake do developers make with Route organization, why does the mistake cause problems, and what is the safer approach? One recurring problem with route organization is applying it without understanding the boundary it protects. Using a state-changing HTTP action as a GET route merely because it is convenient for linking. In addition, Routes can be grouped by prefix, middleware, name prefix and other shared characteristics to keep definitions maintainable. Safer engineering approach: keep the responsibility in the correct layer, use the framework's supported API, validate and authorize inputs, avoid hidden side effects, and verify the behavior with tests.