If someone has a lot of weight to lose and are truly serious about getting healthy then they should do it anyway they can. If it takes eating #### to get down to a weight that will allow them to be more active and then eat better food then so be it. I don't recommend it but it's better to do something than nothing.
I think it might be worse physiologically and psychologically to lose 50 pounds and then gain it back, as opposed to just never losing it at all. That's just my opinion and isn't really based on a study.
In my past I went from 263 pounds to 199 pounds in six months via calorie counting and a lot of exercise. I was so sick of the diet and exercise that when I reached my goal it was a HUGE relief that it was over. A few years later I weighed 281 pounds. I felt like I had wasted all that effort and sacrifice I made.... as I should, because I did.
I do not recommend any method of losing weight that is temporary at best.
Ultimately, no method that results in a weight loss of 64 pounds is "temporary at best". It comes down to personal decisions after the weight is lost. It's easy to say that whatever you are doing now is working, but what if you fall off the wagon in 3 months and go back to 280? Does that mean that what you did to lose weight isn't important?
I do agree that many people struggle with the transition from "dieting" to "maintenance". But the reason for that is mental, imo.
For instance, if you have cut sugar and refined carbs out of your diet as a way to lose weight, thinking that you can add them back once you get to your desired weight, you'll likely add the weight back.
Similarly, if your goal is to count calories, run and get to your desired weight, thinking that once you get there it will be like high school again, you'll ultimately fail there as well.
But if you know going in what the plan is once you arrive, and stick to it, you can maintain no matter what you did to get there.