This kind of thinking only exists inside bubbles on the internet. The reason very few people achieve weight loss is because it’s difficult. Changing your eating habits of a lifetime is a tough endeavour, especially when you live in a society filled with addictive junk food.
I mean what are you suggesting, that whether you lose weight or not is a matter of random chance? That you’ll randomly begin to lose weight one year. “Oh I guess my gut microbiome changed. How lucky”
Speak to any decent personal trainer and they’ll about how they’ve consistently seen clients lose weight by following simple steps.
It is physically impossible for somebody to take all of the correct steps towards weight loss and then not lose weight. If someone eats at a caloric deficit they will lose weight. If they didn’t they would be a medical marvel.