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

What common mistake do developers make with Component reuse, why does the mistake cause problems, and what is the safer approach? One recurring problem with component reuse 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, Reusable cards, buttons, alerts and form controls can be implemented as components to reduce markup duplication. 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.