If heuristic is adaptive, it takes a form depending on experience, more optimal than a fixed procedure, sometimes successful, sometimes terribly wrong. Simpler kinds may not be adaptive.
You use a heuristic because it’s useful, and “proof” of usefulness may involve any connection between concepts at all, only extreme cases of such connections constitute direct experience.
If heuristic is adaptive, it takes a form depending on experience, more optimal than a fixed procedure, sometimes successful, sometimes terribly wrong. Simpler kinds may not be adaptive.
You use a heuristic because it’s useful, and “proof” of usefulness may involve any connection between concepts at all, only extreme cases of such connections constitute direct experience.