This advice has always come off as paternalistic to me, like the emphasis is on people just not being able to control themselves or something.

The first part is obvious.

The second part smuggles in a fundamentally incorrect take on the "eating too much"/obesity problem, namely that it has something to do with willpower: including "not too much" in the advice implies that we need to be told not to eat too much, but that a diet that naturally induces overeating is otherwise OK.

The third part is arbitrary and unfounded, and if you ignore it you can ignore the second part as well: get some good fatty meat on your plate and you can safely eat to satiety.