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

What common mistake do developers make with Component boundaries, why does the mistake cause problems, and what is the safer approach? One recurring problem with component boundaries is applying it without understanding the boundary it protects. Creating a component for a fragment that has no reuse value and then making the component interface more complicated than the original markup. In addition, A good component exposes a small clear interface instead of coupling the UI element to unrelated application behavior. 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.