Welcome to Head Fi, the place where people buy $10,000 audio rigs, freely trade their gear for other experiences and go to local headphone meets. Its not viable to normal consumers, who here is a normal consumer? Who here pays $2000 for a TH900 based only on its plot points? Nobody. If you are paying that much for your rig odds are good ( the wise consumer ) you will try to gain some real world experience with other gear before you blindly shell out thousands for headphones with no experience at all prior. Once you get to that level, you are more than likely the type of consumer who has some experience in audio and enjoys headphones in general. Normal consumers don't care at all for plotting. Who goes to Best Buy or Walmart to ask the employees working in that department about the plot points of a set of Monster Beats or anything else they sell in the store? Viability applies to a very small percentage, the majority rests in the average consumer who doesn't even know what the hell frequency response is and the rest falls to the experienced Audiophiles. If you want an analytical experience, thats great. I prefer high musicality and fun factor. Those peaks and pitfalls you speak of are not generally found in actual music, its hard to hear and even find most of the time. By that point, you miss the entire foundation of what it means to be an audiophile and why you got into headphones in the first place. You loved music at one point....
Look at the Philips Fidelio L1 charts. The Bass and Midrange plots are crazy good yet almost nobody gives a crap? Why is that? Its because its not an analytical headphone, its geared to actually do something a lot of us forget to do in just enjoying the music, high musicality factor. The end results of the plot points of the L1 are not so good in the upper regions, but damned if that headphone doesnt have the smoothest mid tier upper region ever. Its not endorsed by big name/popular audio enthusiasts so it won't ever be popular. It doesn't look bulky or like a satellite dish on your head and doesn't require copious and dangerous levels of electricity to drive properly, therefor it won't be popular. As I said, Plotting is a nice tool but I'll be damned if I let a machine decide what I like before my ears do. Its just one piece of the puzzle. You have ears, use them first then rely on the measuring gear to sort out which of your choices has the best responsiveness and hope that one is your favorite out of the bunch, its not always the best for your ears despite plotting well.