It looks like you are mixing terms: “heuristics” vs. “blind luck”. I interpret “blind luck” as direct sort: with simple systems one knows little about one can look up most possible outcomes, but the number of outcomes grow up much faster (factorial mixed with power laws) than systems’ complexity (however one defines it). Hence heuristics and other approaches today instead of “just trying it” as your favorite mech. guy does.

However, if you mean heuristics when talking about blind luck and blind luck when talking about heuristics, my apologies.