Why use a power receptacle at all?

Becasue I ran a separate power line to my system and have a 4" box serface mounted, I could wire directly to the power cords, eliminating the receptacle and male plug. Just install strain reliefs and wirenut or crimp the cords to the power line. Has anyone tried this?

Thanks Mark
For convenience?
For sound quality. Of course, it would be a code violation, even in a third-world country.
How do you unplug it in a lightning storm?
Even if you tripped the breaker, the ground would still be connected. The ground is the path for the lightning surge.