IMO, it's better in the long run to just eat the right things, at the right times and in the right amounts rather than subscribe to a certain "diet". Paying attention and tracking what you consume to get real figures is extremely helpful and easy to do now with apps. Creating a sustainable lifestyle will be something to help you long term instead of risking yo-yo dieting.
I think you are right when it comes to maintaining a given, healthy weight. But those of us who have "slipped up" in that regard need a stricter diet regime to get back to that healthy weight.
"In the vast library of socialist books, there’s not a single volume on how to create wealth, only how to take and “redistribute” it.” - David Horowitz
