The prevalence of heart disease, diabetes, cancer, and autoimmune disorders in western society indicates that we are really shitty at being omnivores at best.
Yes. Because people like you lean ridiculously hard into one way or the other. We need a variety of food sources to sustainability receive all the nutrients we need to live. Eating a majority let alone an only meat or plant based diet is the complete wrong direction, and this is scientific fact. At least with plants it's possible to find substitutes, however some substitute's aren't nearly as sustainable as the vegan agenda tries to lead you to believe, Cough coughalmondscough cough. May, Spirulina save us all.
They probably would, and hyperpalatized processed foods and our toxic food environment are a problem that effect both plant-based foods and animal nonfoods.
But it takes a lot of effort to break plants into smaller constituents and rebuild them into something bad for our bodies. Animal products do that by default, and there's no getting rid of that.
(and of course that's in addition to all the other myriad reasons why it's best to not eat animals).