> You can never, ever stop taking it.
You can't stop taking it without gaining the weight back (unless the lifestyle change sticks), but everybody stops taking it in the medium term. The side effects are horrible and stack up over time.
We'll start seeing the miserable condition of very long-term users (or maybe, hopefully, their bodies will reach an equilibrium!), and we will be able to use the sacrifice of their health in order to understand how better to counteract the long-term side effects, or to get hints on how to design the next class of miracle weight loss drugs.
I'm never going to take them. There are better ways to lose weight, with no side effects, and they slowly and stably got me from a 28 BMI to a 22 BMI. I will push the people I love towards those rather than to a set of powerful, expensive drugs with wild side effects that somebody invented a week ago. But I am not hostile to the concept in any way.
> There are no shortcuts in life. There is always a tradeoff.
There are an enormous number of shortcuts in life. This is just the Law of Averages as Protestant superstition stated as a pithy self-help maxim. Taking shortcuts rather than going the long way is almost the definition of intelligence. If you see a bunch of points laid out in a rectangle, you can count them one by one, or you can count the ones on the sides and multiply. There's no tradeoff.