Hah, I was going to edit in 'even if you can hold it in' after I submitted the last post.
Well, it's one point I can't agree. I find it hard to believe that experts in the fields (nutritionists, dietitians) are making up on the influence of complex/simple carbs on one's body/performance.
For instance, you said that you need to 'tolerate' hunger every now and then. It may well be a suitable option for you as you feel that you have a better tolerance to hunger than most, but if complex carbs can indeed make someone 'feel' fuller for longer, due to the longer time it takes to process, then it could be a viable solution option for someone who does not have the will power/tolerance to hunger you possess: for the same amount of calories in carbs, said person may be able to hold longer before feeling hungry, leading to lower overall calorie consumption which helps with weight maintenance.
I do think that we all have some individual difference. For a group of people of same height, weight and age, I am pretty certain that feeding them the same meal and doing the same exercise down to the quantity/intensity would still yields differences. Some may not see much changes, some may gain weight, some may gain muscle. Yeah, I am speculating here, yet I am sure we have at least one person in our lives (if not many) with seemingly surprising development (whether it is ease the person gain muscle mass, fat, or relative ease a person -lose- their muscle mass/fat). That's why I am usually weary of using any single individual as representative on this topic. That said, I do believe that average person (i.e. most people) can overcome the the variance by eat a little less/more, exercise a little more, a little healthier/smarter. But yes, in the goal is ultimately to find a sustainable way to balance calories in and calories out.