Since you asked...

I think it is crap, just like a lot of what is there. As always they take one opinion and pompously present it as the one true religion. I have nothing against folks wearing the things that Riv recommends, but likewise see nothing wrong with wearing bike shorts, shoes, and jerseys.

I find bike clothes to be very comfortable and practical. I typically wear them any time the primary purpose for going out is to ride. If I am just going to the store maybe not. I wouldn't have considered anything else when I decided to do a coast to coast tour and on hind sight I still consider it the most sensible choice for me.

Riv claims that "People who go on around the world trips..." wear baggy shorts and such, and some do. It certainly isn't universal, as they imply though.

They say that you don't need special bike clothes then try to sell you "our own line of bike clothing that doesn't look like bike clothing".