I think "tracking your weight and calories" is useful, but only if you track it right.
You could look at just raw numbers, but IMHO, first you want to be tracking for you, how many calories it took eating X to achieve satiety / feel not hungry.
Then, hopefully, you can figure out how to meet your daily calorie needs/goals in a way that you don't feel hungry all day. It's hard to stick to your plan when your body is telling you it wants more.
People's hungry signals are different, which is why one size fits all advice doesn't work. Personally, if I ignore my hungry signal for long enough, it goes away; this sounds like it might be good, but then I get all headachey and grumpy because I haven't eaten and there's no signal telling me to eat; so I've got to use my analytic brain for that (but it would rather take a break because I haven't eaten). Some people I describe that to think I'm crazy ... if they don't eat, the hunger signal just keeps getting stronger.
I mean, sure. But doing it poorly always comes before doing it well. So, the best advice for people that aren't aware of how much they eat is fine to start at anything basic. Probably the more basic the better. Though, as you note, that will be different for different people.
That last is notable. I agree that personal signals are very different between people. But so is basic capability to track things.
What is truly obnoxious here, is that what works for you will also not be static. Expect that what worked for you now will someday not work.