Uh, so, first, I'll say that bariatric surgery is largely a successful (if extremely invasive) intervention. It is not the case that people who do that surgery somehow compensate eat back to the same level -- on average, they don't. And second, the GLP-1s just massively reduce the urge to snack/eat. I'm sure they are less effective for some people than others, but on the whole they are miraculously effective for the population that overate habitually (the obese).