>For a lot of people, the reason they feel hungry is because the way their brain works is that they feel better when they feel full and their life sucks for some reason

i am not trying to gain traction, i already know what i am saying applies to vast majority of people and i've yet to come across people who feel 200-300kcal deficit is impossible to apply for them because of their insane appetite.

In most cases where people say this, they are sedentary so their TDEE is very low, applying deficit makes them end up in very low calorie zone where they feel miserable.

Why all these people who are failing can't actually define their fitness journey by putting some numbers into perspective?

because they calculated nothing, they just winged it. I am not denying that there aren't people who cannot control eatingg, there are but they are rare.