The philosophy is actually that even if people were doing the exact 'holistic' stuff (which really is not emphasized at all) and were locked in the same room, they would still be optimizing their health with these foods over just muscle meats and fruits. If people disagree they should present their cases against the results of others, not their results on one program to another or based on how they feel without any objective analysis of their current health shared publicly.
Give a modern person the actual breakdowns of blood, whole animal parts, bugs, bacterias, sunshine, lack of environmental damage, and a supposed abundant food energy that an ancient person had, sure that can work. It still doesn't form a limit on whether it would even be the most optimal and people can still improve upon such if they desire.
People can have a variety of personal successes or failures, but when they start attacking this conceptual possibility they are clearly ignoring reality for beliefs. Mimicking/replacing these and doing things that heal/repair are always more important than restricting ones diet to suspected non-problematic foods. This is automatically conclusive if you have any examples of people who remove 0 such foods and have done better. This is especially true when people label things as 'natural' with known, and unknown consequences, like ocean fishing or eating exclusively muscle meats and eating without their corresponding bones/blood/organs - missing the very nutrients that were replaced throughout our history with things like milk and processing plant food. This 'wholeness', or at the very least nutrients and minerals (that are absent in meat and fruit), are essential for human health, often in any form one can get.
As for examples, there are plenty of people on to other things, or those failing to even have what would be a regular standard of basic health and rationalizing it with their following a set 'natural' program which 'must be good', and also lots about these programs which are actually great and thus can be plenty good for many folks. These positives have little to do with the purism aspect but with removing some obvious poor habits, adding in healthy proteins/fats/bacterias and so forth and the fact that not everyone is set up to do things like immediately manufacture lactase etc. and compounded with the possibility that alot of PD tools maybe arn't what people need either. Its making health decisions on a case by case basis that is important thing to walk away with..and making sure one actually gets proper nutrition over ideals, not that there has to be some magic to honey or dairy or whatever.