There's clearly some limit to this line of thought though. Maybe it's valuable to know how to write your own make file. But have you built your own microprocessor by soldering together transistors? You have?! That's awesome! Have you built your own soldering iron?
Yes, thank you! That is what the latter half of the first paragraph is about - we make judgement calls about the tradeoffs involved with a crutch all the time.
The point isnt to accept a heuristic that points one way or another, but to be conscious about it being a choice that we can make that can have various trade offs along a spectrum. As usual figuring out what trade offs to make is highly dependent on what your goals are.
