The issue with that thinking is it's super black and white, that willpower alone is the cure to weight loss.
So let's do a little thought experiment , what about all those naturally thin people, like really thin.. they can eat what they want and remain thin, find it hard to put on muscle. If it's really really hard for them to gain weight... Then isn't the inverse also true? Aren't there also people who are trying to do everything they can but for similar get inverted reasons just cannot lose weight?
The problem with relying on willpower alone is there's a finite amount of it.
Yes, for some people they have terrible willpower, they have terrible diets, and they do not work out. But they aren't the only ones. There's definitely others who are trying but failing... And you can only fail for so long before you give up.
So going back to my first point. I hope these drugs enable a new option, to get them past a certain point where they can lose weight without the failure... Begin to make better choices... Gain more confidence and willpower.