I was thinking about this argument yesterday and 3 points came to mind. Both are important to me as the distinction I draw between MC and SW&D philosophies.
1. MC doesn't care about brands as long as the piece looks good. Of course, we will drool over RLPL, because it mostly looks great on everyone, but we will equally respect and adore a $5 thrifted sport coat if it fits well and is harmonious with the rest of the outfit. SW&D, on the other hand, pays a lot of attention to brands and often defines the "awesomeness" of an outfit based on the maker.
2. I have a lot of acquaintances in various social circles and nobody dresses like Mr. Shah or the other extreme SW&D posters. Most people wear some ill-fitting version of the MC casual wear sprinkled with some hipster or office plankton elements, depending on the setting. This leads me to believe that MC-version of toned down casual wear is more socially acceptable than the extreme examples in SW&D.
3. My whole life, be it professional, art, cooking or clothing has led me to believe that there is a certain path from novice to amateur to expert, and that path is always from more complexity to less. Sublime subtlety seems to be the most difficult to achieve. A couple simple examples from everyday life:
a) cooking: beginners want to mix in more stuff, more spices, more flavors. As they become more experienced, they focus on combining a few high-quality ingredients to truly appreciate their taste.
b) photography: beginners want more photoshop, more colors or black and white, retro styling, hdr, etc. Most professional take a few shots and mostly leave them unedited, because true beauty and talent is in simplicity, not covering up a lack of originality and skill with filters and airbrushing.
To me, MC represents a natural progression from SW&D. From brands to appreciating a certain aesthetic. From many layers, stacking, etc. to simple lines and elegant designs. From rebelling against society and desperately trying to be original to becoming one with it, but a step above everyone else.