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Yeah, that's definitely 'the' Kurt thing, vocal melody completing power chords. I do hate how he (and the whole generation, and some of the punks before him + no wave crowd as well) pretended that they didn't know any music theory or practice at all. That was quite destructive for so many of us who aspired to play music in our teens, especially if you weren't exposed to music theory and practice in childhood through…
Going back all the way to the '60s, if you listen to interviews with Paul McCartney of The Beatles he states very plainly that he knows no music theory, and can't read music. I suspect this is true of many great songwriters, maybe even most of them. I would even argue that studying music theory may even make you a worse songwriter, because the most innovative songwriters don't seem to follow some clearly established…
For example, McCartney tells a fun story about The Beatles traveling across Liverpool to learn a single B7 chord in their early days: https://www.youtube.com/shorts/_r5B1AhP1Fo