Most of those CB irons that pros use are still 'blades'. I define blades as thin top line, thin sole, minimal to no offset, and small heads. Once you have a club that fits these criteria, it doesn't make much difference if you have a little metal scooped out of the back or not.
As for making the game harder on yourself, let me use a fishing analogy: Most fishermen use spinning equipment because it's easier. I have used spinning all my life. However, 2 yrs ago I got my first conventional casting reel. Conventitonal casting reels are looked upon as difficult equipment for 'serious' fishermen. Nonesense. It tool a little dedication and work, but now that I have become adept at using casting reels, I will never go back because the sensitivity and control are unmatched by spinning.
In the same way, blades require a little more work and dedication, but in the end you are rewarded with better technique, and you will have the feedback necessary to know when you're a little off.
I believe for the purposes of that article they define a blade as a muscle back iron. I think center-of-gravity-wise there is more of a difference than most people think. I kinda get the analogy between fishing and golf, but not really. You have to play your misses in golf.