In 1970 a working programmer could name every tool in the sky. This is what happened next.
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Every dot is still up there — dimmer, maybe, but in somebody's production system. The sky only gets fuller, and nobody can name all of it anymore. That feeling that you're behind? Everyone has it. It's not you. It's the sky.
Curation: things a working developer was broadly expected to have an opinion on, dated by mainstream arrival, not first commit. Fights about the list are the point.