Anyone who claims it's crucial to know how things work below a productive tool is being straight-up exclusionary.https://twitter.com/theevocater/status/830104244439117824 …
What about cases where it's not a can/can't? e.g. "You can get by with just ActiveRecord, but it'll help to learn SQL"
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Even with a solid abstraction, I think it's often beneficial to understand the next layer down.
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Even if it's not a "real programers do x" thing
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