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

What common mistake do developers make with Deferred behavior, why does the mistake cause problems, and what is the safer approach? One recurring problem with deferred behavior is applying it without understanding the boundary it protects. Running expensive database queries in a provider's boot method on every application startup when the value is not required for every request. In addition, Some provider-driven services can be deferred until a related binding is actually needed, depending on supported framework mechanisms. 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.