No, I'm not, I'm saying design languages with well-defined motivating principles like Material Design and Microsoft's ex-Metro language are both more complete schools of thought on design (starting with identified principles that cover broader scope of design problems) and more specific, well-defined approaches to design/interaction (clearly defining both foundational principles and the applications of those to specific areas of design) than things like "flat" design.
No, I'm not, I'm saying design languages with well-defined motivating principles like Material Design and Microsoft's ex-Metro language are both more complete schools of thought on design (starting with identified principles that cover broader scope of design problems) and more specific, well-defined approaches to design/interaction (clearly defining both foundational principles and the applications of those to specific areas of design) than things like "flat" design.