Here’s the thing. Over millennia of specific farming, even fruits and vegetables have changed dramatically, to contain more sugar (to be sweeter) in place of nutrients, and to have more flesh. As such, while they are still, naturally, healthier, the ‘whole foods’ diet is by no means undeniably the best.
Of course, it does make it difficult to overeat, and that is good in terms of weight, but there are also a host of issues. Firstly, if you opt for a more fruitarian lifestyle than vegan, the glycemic index of the fruits you will likely be left with (berries and such) are medium or high. Whilst these won’t be as bad as some processed foods, such as high fructose corn syrup, they also aren’t good for you.
As an unfortunate consequence of the farming methods detailed above, it is also reasonably difficult to get an optimal micronutrient intake from fruits and vegetables (and grains) alone. Whole grains also bring into account the question of anti-nutrients like phytic acid.
There’s a lot more to debate on this topic than you seem to think. Naturally the diet you recommend is healthy. However, for example when it comes to your comment on minimising meats, a 2016 study from the University of Graz in Austria, testing the health of various different food groups, included in its conclusion the following: “Our study has shown that Austrian adults who consume a vegetarian diet are less healthy (in terms of cancer, allergies, and mental health disorders), have a lower quality of life, and also require more medical treatment. Therefore, a continued strong public health program for Austria is required in order to reduce the health risk due to nutritional factors”.
When it comes to optimal, I think whole foods do have their place, but alone can not provide everything in today’s society. Supplementing them with a carefully blended micronutrient mix, ideally composed of a mix of various amino acid chelates (to prevent phytic acid and other antinutrients minimising nutrient absorption) and semi-regular fish and meat is more likely to be optimal than taking any one of these factors on its own.
Much of these current recommendations stem from an unfair victimisation of saturated fats (the primary fat from animals) and incorrectly linking this to an increased risk of cancer and heart disease. Salt too has been targeted to an extent, with table salt being the main issue. Purer salts - such as pink Himalayan salt - avoid the issues of table salt somewhat, and higher intakes are less dangerous and can even be beneficial.
There’s a long way for us to go to expand our knowledge of nutrition, but in the meantime, there are many perfectly valid diet plans people can follow that are likely just as healthy as each other. Whilst a whole foods approach is (likely) healthy, there are others that can be too.