It's unfortunate that misinformation like this gets spread around. It's so hard for a newbie to seperate fact from fiction that alot of them end up taking something like this as Gospel.
I'm a mechanic in a Honda dealership. I've seen 600rr's that have had over 100,000 kms and have not needed any shims, same as race bikes that have been used season after season,(also 600rr's) with no shimming required. However, as of last Friday, I just did 2 450x's that both needed to be set.
For any new rider or new mechanic reading this, please believe that regardless of what type of valve adjustment your machine requires, it will, at some point, need setting..