Aeroplanes have thousands of ways to kill you. If you can devise a checklist that covers you against every one of those ways, good luck in implementing it.
Complacency is a dangerous thing. Being an impostor is also a dangerous thing.
Adopt a "security state of mind" and reduce the likelihood of being a victim of an aviation incident.
A checklist minimizes such a likelihood by providing a structured approach to performing aviation procedures in a consistent way. It assists in minimizing the risks of that "thinking process" when engaging in aviation context.
WP