If you own a home, and hire somebody to design a porch, they don't get to tell you to STFU and do whatever they want to your property. Conversely, when a person owns a baseball team, the GM serves at the owner's pleasure.
I really don't get this "Getz has no authority" BS. Every single GM in baseball gets a budget, and even guys like Cashman, Dombrowski and Friedman get their leashes tugged from time to time. With a lockout looming, all GMs are finding out they aren't these renegade swinging dicks we all fantasize them being.