> being less sedentary and leaning about maintenance calories and how calorie surplus and deficit works?

Because it's useless advice that doesn't work in practice. As witnessed by decades of failure, with the only thing turning the tide on the obesity epidemic on a population scale being GLP-1 drugs.

> if there is no resistance, simply prescribing GLPs to average person may become a new normal.

Probably not ideal, but until Western society decides to change from the ground up it's better than the alternative which showed literally nothing but failure. One is something that works, the other is something that will take multiple generations to correct.