By necessary evil you mean the inevitable need of dietary glucose or our dependence on glucose as an essential metabolite? </blockquote>
Both are true. As far as glycation is concerned whether you get the glucose from protein or carbs it doesn't matter.
The only problem with carbs is that it stops fat metabolism during the time it is being digested. But that is not a big problem, except for the diabetic.
People here consider it to be a big problem, but when you look at the big picture you will find that its not that big a concern.
To lose fat you need to control your insulin. But not otherwise. You do need to avoid other bad things like grains, milk, alcohol, coffee, etc.
I agree with you that artificial sweeteners do not raise insulin. Even fructose barely raises it. But they are most probably dangerous to us.