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

What common mistake do developers make with Queued listeners, why does the mistake cause problems, and what is the safer approach? One recurring problem with queued listeners is applying it without understanding the boundary it protects. Creating events for every internal method call without identifying a useful boundary that actually benefits from decoupling. In addition, A listener can be queued when its work is slow and should not delay the original request. 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.