Eating less is entirely a personal willpower issue.
The problem is if we could just increase will power for everyone, we'd cause more problems than we'd solve. Too much "will power" means literally insane people. You'll have people exercising until they die of exhaustion/stroke/etc. You'll generate anorexics. You have psychopaths since willpower overwhelms every other consideration. People pursuing self-destructive dead ends all over the place because they no longer listen to their bodies, their peers, or just plain common sense to STOP.
We cannot just increase will power. The problem is with the other side: the body thinks it's starving, so is triggering extremely loud survival instincts that overwhelm will power. We don't want to make will power so great that it always overcomes survival instincts (like the need for sleep, pain in a tooth or a sliver, etc... all these are things we want people to still respond to so they don't kill themselves), we want to tamp down this false survival instinct of hunger to that of a normal person.
I don't understand your argument. How does the OP just talking about increasing willpower, equate to advocating for people to ignore their survival instincts? Or do you consider any act of increasing willpower something that will eventually lead to someone ignoring their own life?
But ignoring all that, people want practical weight-loss programs that work in the real world, not just on paper. Personally, I don't see the point in arguing about methodology when one can simply 'practice what they preach' and show that it works. People have been losing excess fat in various ways without killing themselves, so it seems like there are multiple solutions to this problem.
If you just increased willpower to overcome this much stronger hunger drive, you'll have increased will power beyond any kind of equilibrium with the other (weaker) survival instincts, thus increasing the probability of some unintended problem.
The solution isn't to just increase willpower, as will power isn't lacking and increasing it more could cause problems. The solution is to address the real issue: the body's exaggerated response (i.e. releasing hormones which cause the sensation of hunger even when the individual is overweight) to fighting caloric restriction.
