The heuristic is one of those for the mid-experience developer. That's the point where you spend two weeks re-implementing Set<T> to save 1 cycle. Or over abstr

The heuristic is one of those for the mid-experience developer. That's the point where you spend two weeks re-implementing Set<T> to save 1 cycle. Or over abstract. Lots of developers never get past that point. Experienced devs - such as yourself - generally know how to write reasonably fast code that is also clean (or easy to extend) first time. In my opinion we should be more explicit about this in the heuristics.