For the purposes of this discussion, a carb is a carb. They all end up at the same level of the Krebs cycle as 6 carbon fragments. Like it always has been, the total amount of carbs in your diet is important because it's the total amount of calories in your diet that matters most.
When it comes to your health, you should only be concerned with the source of the carbs if you are unhealthy. If you are already healthy, it generally doesn’t matter. For a healthy body, total calories consumed vs. total calories burned is what really matters. Same as it ever was.
You’re flat out wrong. All carbs aren’t alike in how they are processed in our bodies and we really have only had a couple of generations of ready access to so many sugars and other simple carbs.
That is the nub of the problem.