"that in a vacuum has no effect of calories out except generally a negative effect (your body will adapt and try to burn less calories)"
This is comically overstated. No, your body doesn't magically become super efficient. This is, again, feel good pablum to make people feel better about their situation, sure it is an unwinnable battle without Magic Product or System ("buy my new book and subscribe to my It's Everyone Else's Fault newsletter!"). But the feel good stuff clearly is astonishingly ineffective. This tact hasn't worked.
Find any person who is overweight but claims they starve themselves and log and count calories. In 100% of cases you will find a calorie excess, likely significant. Find someone who is a healthy weight but claims they "eat anything they want". In 100% of cases -- okay 99.9% maybe they have a big tapeworm -- they will have a lower caloric intake.
The latter is someone who likely skips meals. They don't snack. They don't drink giant sugary drinks. And then when it's pizza day they have four slices and all of the high BMI sorts lament how they wish they had such a "high metabolism" and that they can "eat anything". It's all bullshit.
There is a significant, very difficult psychological component to eating in excess. It is a very hard problem. But I'll take every angry downvote by people who seriously want to refute the core, fundamental truth about calories, likely while parroting nonsensical myth.