In literature, typically anything with the word “master” before it is going to be something both controlling and nefarious. For example, if a science fiction novel references a “master computer,” you can bet your last credit that it is either threatening the existence of humanity, or has already wiped us off the globe.
This is why the idea of a “Master Plan” for the City of New Orleans has always been viscerally unsettling to me. It’s as though there’s some cold, unfeeling entity out there that seeks to control every aspect of using property in the city.
Gut feelings can be off, of course, but this one is not.