As mentioned by @Holger1980 the post by @Coach.Neal.H covers the reasoning for this. Essentially there is benefit to reducing the intensity of some of these original literal sufferfests so that people can work out more consistently and regularly hit the targets. There was almost some mysticism in the originals in that they were in someways unattainable, and who doesn’t love chasing something that they may never even reach 
but essentially the new workout intensities were designed so that people can follow and complete them better. For the pain lovers out there, you can still up the intensity percentages on there a little bit if you want that original lung busting, blood boiling, leg searing agony
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