Nuts are nutrient dense. Tubers are not.
Re nuts: Some are lower in omega-6 than others. Its worth remembering that animal meat has omega-6, and so do most plants. If you avoid the higher omega-6 ones, favour walnuts, almonds and macadamias, and soak, sproat or ferment some, I dont see the problem.
Almond milk is very low o-6, and high in calcium, which can be low on dairy free diets. Theres an issue with high meat diets, in screwing the copper to zinc ratio up, if you dont eat organ meats. Things like nuts (high in copper) help mitigate this.
Ratio for women is supposed to be 5:1, men 10:1. If you want to get copper from whole foods, without high levels of zinc or iron, your options are pretty limited - liver, nuts, seeds, or cacao.
So I disagree entirely. I dont think anything should be eaten in excess, but I think its a very bad idea discouraging people away from one of the rare high copper foods, when they are eating a high zinc diet most likely without any beef or venison liver involved.
If people find they have weight issues, or are eating too many of the higher o-6 nuts, sure they might want to cut back, and exercise some willpower.
I am personally not sure I see any real benefit in starchy tubers if one isnt very active and particularly doing regular anerobic exercise like weightlifting and sprinting.
I certainly cant see any merit in eating as much of them as people eat rice or pasta. I used to eat under calories, very little sugar, in a mostly carb diet. I was overweight. My metabolism was screwed.
Now I eat over calories often, in a low carb diet, and I am still losing weight (I found my xyiphoid process the other day). Admitedly my thyroid has been slightly overactive due to excess iodine and perhaps not enough copper food. But I think this suggests that more inactive people should moderate carb/starch intake. Even active people seem to do well with only moderate carbs.
How optimal your diet is, is something people should figure out on there own, by reveiwing various peoples cases.
I have reservations about the wholesale banning in paleo of large numbers of food groups. Once youve cut out eggs, nuts, nightshades, fruits, carbs, dairy, oxalate plants, legumes etc etc etc and you havent got the assistance of a skilled nutritionist or are being very careful, chances are good your deficient in something, or your risking an imbalance. Its a bit OTT sometimes.
These HG diets are high refined to obtain proper nutrients from the local foods. Doing such a diet, totally ad hoc, in the modern era can be problematic.
So: I say start with just cutting out wheat/grains, vege oils, probably legumes, definately refined sugar, and processed foods (ie roughly paleo 2.0).
Leave everything else up to individuals own interpretations of various informations (Carbs, eggs, dairy, nightshades, oxalate plants , ra ra radi rah).
Add to that if your losing weight, you probably want to keep carbs under at leats 150 grams, if not under 100 grams.
And if your problem solving autoimmune or gut or other health issues, you may trial eliminating ONE group at a time of the above mega-list, while being careful to replace missing nutrients.
Theres plenty of variants and information out there. I think the best thing we can do as a community is disagree vehemently about every one of those other details, so that people do look into things themselves, and shock horror, think for themselves and drop the group think mentality that pervades our modern society.