Your sources don’t even refute this. Yes, supplementation for things like B12 and omegas are required. We eat a variety of fortified foods in the modern age anyway and supplementation is trivial. Yes, you need to eat a diverse range of foods to obtain a balance of essential nutrients. That doesn’t mean you cannot maintain long term health on a vegan diet.
The sources do refute your point; I can tell that you have not read them, as you ignored addressing the part of my comment about bioavailability (which two of these sources mention).
Edit: Hopefully you read this after this edit, if not can address as a followup. Here is a page on the NHS specifically referencing how all nutrients can be obtained on a vegan diet: https://www.nhs.uk/live-well/eat-well/how-to-eat-a-balanced-....
From your second source:
> Carefully constructed vegan diets could provide adequate amounts of all six priority micronutrients for the general population, except vitamin B12, which would need to be consumed through fortified foods or supplements.
Further, the opening paragraph of your third link undermines your entire argument as well
> Diets that limit the consumption of animal source food to very low levels require careful fortification or supplementation, and the inclusion of specific nutrient-dense plants. If these cautionary measures are neglected, vegetarian and, especially, vegan populations risk to suffer from deficiencies in some key animal source food-associated nutrients."
It specifically says that vegan populations risk deficiencies when not including nutrient-dense foods and fortification/supplementation. It specifically does not say that full nutrition is impossible without animal products.
Event the title implicitly supports my argument: "Not all (micro)nutrients are easily obtained from plants." Emphasis on "easily."
The word "cannot" only appears alongside B12. The phrase "does not" doesn't appear alongside any nutrients intake. And the word "impossible" doesn't show up at all.
Are you sure that you read the articles you're claiming that I did not read?
You need supplementation on a vegan diet for a reason. Entirely plant-based diets are not nutritionally complete. Even with proper supplementation, bioavailability is extremely low in plants compared to animal foods.
https://www.diagnosisdiet.com/full-article/meat
https://www.frontiersin.org/articles/10.3389/fnut.2022.80656...
https://aleph-2020.blogspot.com/2019/05/animal-source-foods-...
It is okay to be a vegan for your own moral reasons, but to push it on others as it being an intelligence choice (it is not) is to be inconsiderate of one's fellow human beings and their long-term health.