As for transitional diet, its designed to simply be a better diet, correct or not. For some, things of course might be wrong or not applicable particularly since not everyone needs to do alot of complex stuff to be healthy. Also its not likely that one person understands this stuff completely accurately and will have their own bias. So what if some people can get by on any number of natural type things. Many people if they just starting following the food pyramid to a T they would improve drastically, and that system couldn't be farther from the truth. So, like all diets, people have some relief seemingly from not-doing x, y and z and want to make a religion out of it. All of a sudden shit that noticeably works in the present or even for people for 1000's of years is just plain wrong.. hmm ok. Must be wrong...has to be. 'I ate milk once and got diarrhea and cavemen didn't have it', totally conclusive except for that thing how healthy thyroid means perfect production of lactase enzyme...
and with that and the 'can't improve on nature stuff' its less about the past and more about the examining the present results of present application. The ancetral swiss ate almost entirely mineral rich grains and dairy with next to no meat or fruit. One doesn't need to recomend that as a healthy diet (at least for today) to acknolwedge that this was a solution for them in their time to live ok into their 100s with no cavities or medical intervention, and just maybe it has something to do with minerals. Even though you'll have people dispute that they were 'healthy', you can find tons of people today recomending perfect diets of our ancestry with shitty teeth and have rampant signs of poor health disguised as 'feeling fine'. Nevermind how even lower paleolithic skulls of thirty year old men had disease destroyed teeth.
Simply put, people find some or all of the stuff is unnecessary or were problematic for them. Which even if someone believes in the stuff, is not super shocking as just shedding the neurotic elements about it is probably very benefical. Saying otherwise about transitional approaches or to swaying cravings must be missing Aajonus himself dropping lbs of dairy and honey every day still after 40 years. If the purists actually want to present their results or at least show their pics and so forth and how drastically better they are over AVs personal successes so be it. Or if they want to just explain how it wasn't working for them, maybe thats more appropriate than their own private hypothesis of why people do what they do.