I really don't understand these confident assertions that it's literally impossible to change unhealthy usage to healthy usage. Do you mind if I ask why you're

I really don't understand these confident assertions that it's literally impossible to change unhealthy usage to healthy usage. Do you mind if I ask why you're so sure that there's no hope at all for incremental movement towards healthy engagement? Leaving aside the fact that I can think of plenty of counterexamples, I've seen this line of thought over and over and I have no clue where it came from, beyond handwaving about all-powerful ML algorithms.