I guess you have never heard of a "liver". That's where surplus glucose is stored and is only released on a "as needed basis". Insulin keeps glucose from intoxicating the blood - we all know this.
I at one time was pre-diabetic. Stopped eating candies, debbie cakes and sweet tea and moved toward brown rice, potatoes, fibrous veggies and lean proteins and my problem went away and has been non-existent since. So I know from anecdotal experience what really pans out and what doesn't.
Everything in moderation. But when trying to get big, you'll need lots of all three macros.
You also didn't talk about the dire need of carbs for anaerobic exercise such as weight lifting. ATP is unable to use fatty acids in this case. It cannot be used under these conditions and therefore a surplus of glucose & creatine need to be present for outstanding training sessions.
You also have deliberately ignored the conversation surrounding the fact that the rate of digestion means everything to whether or not a carbohydrate is healthy. Sudden increase in glucose in blood = fat storage & yo-yo blood sugar. Over time, that = Type II diabetes.
Bodybuilder's diets = anti-diabetic. We care about sustained energy and sustained anabolic activity which means we need to avoid sugar spikes which things like table sugar and debbie cakes tend to give us. Lastly, we need lots of micronutrients, which you have also sorely ignored the topic of. Without proper nutritional values in our food, we'll be deficient - especially routine trainer's like myself. It is imperative to have all the micronutrients to have a properly functioning body. Considering all carbs as equal is a very dangerous piece of advice to be giving out. They aren't equal. Sugar is empty calories. Potatoes are not.
Cells use fatty acids or glucose to make ATP. I think you need to take another look at that comment again.
Im not proposing ppl eat sugar, it merely has been used as an example in this conv. Once glucose is in the blood the body doesnt know the difference where it come from. The glucose molecules are all the same. You are referring to the breakdown in the gut and how quickly the ingested carbs are turned into glucose. That's another story.
If you want to learn more about that, I suggest you buy a glucose meter and eat different carbs and check your blood sugar. You will be suprised what you will find out.
By reading your post I can see you have a general understanding of glucose but there is more to the story.
BTW, there is little need for carbs for anaerobic exercise. Do you have any proof to subtantiate this claim?
I've trained for months at the time with very low carbs, such an apple a day or something like that in total less than 100g of carbs per day in general. By eating enough fat I could train 5 days a week one hour a day without any problems plus some cardio.
See, when you want to lose body fat most of the calories come from fatty acids not glucose. Triglycerides are broken down into fatty acids from your fat deposits and some other compounds not important in this conv, and many cells use this for fuel and create more ATP than glucose does.
Obviously it is well researched that 1gr of fat had 9 calories, and 1 gr of glucose has 4.
Also to get back to your other comment, the liver stores roughly 75g of glycogen....not sure what your point is with that. In normal conditions the liver rarely gets drained of that glycogen and to replenish it only takes like a small amount of carbs. That glycogen is mainly used to sustain a stable blood glucose not to store large amounts of glycogen for anaerobic activities. If persisitently glycogen is forced into the liver, the liver will either dump it into the blood stream as triglycerides or you end up geting something called a "fatty liver".
I wish you would look deeper into how our bodies work rather be quick in pointing fingers at my statement. There is a lot more than glucose when it comes to body's methabolism.