We also seem to have trouble acknowledging there's a toolbox full of tools, and determining when its worth acquiring a new tool vs using an existing one.

(aka, there are scenarios where the dumbest language might in fact just be the smartest choice.)

From an engineering judgement, seems he got precisely the result he wanted; which was to get from A to B in the shortest possible time, with gains beyond that (maintainability etc) very much a secondary concern. To me that seems to preclude acquiring a new language.