> So this isn't really 3 separate unrelated changes. Also at least in my experience, people tend to regard high protein things as the "energy dense" part of a meal - the problem with a lot of carbohydrates is they're not very filling.

Who are these people? I suspect a lot of people who are overweight/obese and taking GLP1 drugs have very little to no concept of proteins role in their body composition. Essentially all a GLP1 drug does is modulate down your hunger (and you get full faster). That does not give you any of the tools or skills to create a diet or exercise plan. Both of those require intentional planning, research, skills, and time. They're definitely 3 separate things.