It actually is intuitive eating, the way I learned it in recovery from anorexia (actual anorexia nervosa, not delusional anorexia like fats have...).  I was taught to listen to that cue, respond to hunger and differentiate satiety from fullness, and have maintained at a BMI of between 20 and 20.7 for 10 years now.  I think it can work, but realistically knowing that fullness is too far, too much most of the time will never work for stupid fats.  Humans can do it, some actual intuitively, and some, like me, with time and training.