Earlier quoted context omitted.
Someone reading this might assume its zero sum to you - as if people on Ozempic have not already been exercising and monitoring caloric intake without the associated weight loss/health results they desire - and have only chosen it because they don't want to try something else. I'm sure you aren't trying to come across as fat shaming, but the reality is of course not zero sum. Diet and exercise doesn't magically work…
Diet alone is 100% guaranteed to cause you to lose weight. It really is as easy as counting calories. It is a scientific fact. It is physically impossible to gain, or maintain weight, if you cut caloric intake sufficiently.
But you're saying "it is as easy as doing activity x" without concern for the difficulty of that activity. There are a wide variety of reasons some people might get fat, but once you are fat, it is far more difficult to get not-fat than it was to get there in the first place. There are a wide variety of feedback loops within the body, including epigenetic ones, that make it much harder to lose weight and keep it off.
Once upon a time, it was trivial for me to not eat garbage food, or too much of any sort of food. I had more trouble trying to eat enough to be in a large enough caloric surplus to get enough protein in and stay in a large enough caloric surplus to build muscle. I never had "food noise" or anything of that nature. Then life happened, my circumstances changed, and I had less time to worry about food. I spent more time going out with co-workers and friends eating and drinking. Other nights, I was too busy to cook, and ordered in more. My weight went up, and before I really realized it, I had put on significant weight. And I realized that something I had found trivial before, something that had taken zero willpower, that I had never struggled with... was something that was incredibly mentally taxing.
Could I count calories and lose weight? Of course. Could I add exercise back in to my routine? Yep. But it was difficult in a way that I never had understood back when I was fit, in a way that I never would have believed could happen to me. And as soon as I got busy again, or had other things occur in my life that took priority, the mental effort to keep "just counting calories" and push down my food cravings and hunger no longer seemed worth it.
I could exert a huge portion of my willpower on this, struggle with it, remove my capacity to spend more time having care and empathy for others, forcefully deprioritize other things in life... or I could use a GLP-1.
I know which path made sense for me, and it's been a hugely beneficial thing in my life.