I think in a profession where impostor syndrome can run rampant, being overzealous and participating in/subjected to holy wars over tools/workflows/etc. is, unfortunately, a major byproduct of that condition; people are always going to try and find some form of validation that they aren't a total moron, especially in this industry, and so if you are a vim user and buy into it being THE text editor that REAL PROGRAMMERS use, then anyone who uses anything else is challenging that belief system that you've invested in as a way to prove your worth (both to yourself and others).
This is also compounded by the fact that the amount of stuff to "know" about programming is increasing at an exponential rate; it's no longer sufficient to merely know a language, you also need to be familiar with associated frameworks, different IDEs, etc.
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