I think not eating just for hunger is a big part of the reason why the advice “eat fat to satiety” is insufficient for some (many?) to achieve their desired weight.
For myself, going low carb and then keto made losing weight possible but it didn’t make it effortless. I had to learn new habits, make rules, set reasonable goals, track what I eat and the resultant progress, and make adjustments and apply a little discipline. Which sounds harder than it has been. It hasn’t been hard for me but it requires some focus and effort which is amply rewarded in satisfaction through improved health and growing confidence that I am in control of my well being.