heuristic program, heuristic rule, trial-and-error, unheuristic, non-heuristic, nonheuristic, unmethodological, researchy, untheoretical, nonmethodical, more...

algorithmic, systematic, rigid

Occam's razor, more...

simple, useful, greedy, positive, new, good, negative, based, local, general, second

simplified approach,   thinking shortcut,   good rule of thumb,   mental tool,   cognitive mechanism,   tool method,   a rule of thumb,   elegant solution