Well do I shoot jpg only because Ken says so? No of course not. I shoot jpg and raw. I mostly use jpg, but sometimes I think I can get more out of a picture by developing the raw file. Then it's rather easy to have it at hand. Or do i follow Erwin? No of course not! On many occassions my smartphone is the best photographic tool for me, simply because I forgot to take a camera with me. Besides that I shoot with every brand that meets my needs at the moment (which are Canon, Sony, Panasonic and Olympus).
But what surprises me most is the amount of controversy guys like Ken, Erwin and the likes generate. Why's that? They don't force you to think or act like them! You'd be quite stupid if you followed them blindly. My point here is: read their writings. Love it, hate it or whatever. Put it in your rucksack full of photographic knowledge and go your own way!
I myself keep reading Ken Rockwell because I like his tongue-in-cheeck-opinions and his patriotic American attitude. Both bring a smile to my face and I don't allways take it too serious. Or Erwin Puts. I'm always bewildered by his enormous technologcal knowledge. In a naive way I like to get teached by him. But in the end I take pictures the way I like, the way I think is best and with the tools that suit my needs.