Andrew I like your site and resources you provide, however this statement is misleading.
"If you’re not shooting with the best possible image quality you’re letting your content down."
A camera is a tool and it should work with a story and often time the imperfection in resolution, lens distortion, grain/noise, faulty color add to the story with its greedy aesthetics .
There is many great examples when low-end cameras provided great results, look at some Dogme 95 films like The Celebration or Danny Boyle films...
Camera will not make your film, actors, set design/location and lighting does, sometime low res camera is more appropriate to hide low budget set design/make up and other imperfections..... You need to leave a some space for viewer imagination !
If your statement is correct, forget shooting and use computer animation which bypasses all the imperfections of the image capture. (Actually this is already happening in the big budget productions)