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

What common mistake do developers make with Boot phase, why does the mistake cause problems, and what is the safer approach? One recurring problem with boot phase 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, The boot phase runs after providers have been registered and is suitable for tasks that depend on other registered services. 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.