Not dishonest, and not FUD. I'm simply stating the obvious -- we have cultural norms around a balanced omnivore diet that happen to include a lot of these micro and macronutrients. Most people don't even think about it and will only be deficient in a subset of micros. When people swap to veganism or vegetarianism they don't have the same cultural norms to fall back on and struggle to fulfill micro and macronutrients, which results in stories like the one upthread. It doesn't do your cause any favors when you ignore people's suffering from lack of nutrition while trying to swap onto it.

As far as the extreme label goes, any highly restrictive diet is extreme. Veganism, carnivore, keto, etc.

They didn't say "cannot be sourced except from animals". They said "easy to miss out on". You're arguing against a strawman.

Anyone switching to a vegan diet certainly would be well-advised to pay attention to micro-nutrients and make sure they have their bases covered.