It's great to be active, but there's more to it than that, namely that our modern world has highly engineered our food to be highly energy-dense and incredibly appealing. So the root cause is an evolutionary mismatch with our environment, which has diverged incredibly from early humans. Expecting an individual to overcome won't generally work, since their brains are simply wired for it. Sure there are some people who can simply choose to ignore the fast food place at every corner and go to the gym via willpower alone, but they are exceptional in their brain's capacity for executive control.

Personally, I look at GLP-1 agonists akin to wearing glasses. Some people are just born without the ability to regulate their appetite in accordance with our society, but there is a tool / prosthetic to change that. That said, it's not one or the other, it's always great to be more active.