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now I'm reading comment threads about "but /nix violates the FHS!"

The FHS is a Linux standard. MacOS (however it's capitalized these days) is not Linux. Little things like the presence of /Applications, /Library, /System etc might offer the smallest nuggets of datapoint that, whatever MacoS reason for disallowing /nix, its noncompliance with a standard for a completely different OS that MacOS doesn't comply with either is probably not relevant

Meanwhile. I wonder if I can just reinstall from the curl|sh line, or will that cause conflicts with whichever parts of my old nix install it hasn't wiped out?

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