Your hex editor should color-code bytes

Color coding is a simplistic, half-assed way of doing semantic analysis. Go full assed and make an /etc/magic aware file decoder that decodes and highlights anomalies.

Any good neovim plugin recommendation for hex editing?

It'd be nicer if the hex coloring actually matched the "ascii" coloring as well. Orange on the left but green on the right does not help find things.

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I actually stopped reading after the intro because I fundamentally disagreed with its premise. The "find the C0" took me about 1/4 second with uncoloured. Looking at the coloured took my eyes about 3 seconds to recover from the colour overload, then I was scanning down and found the colours so distracting with the constant switching between orange, pink and yellows than it took me a total of about 5 seconds to scan down as far as the blue C0. Maybe if it was all uncoloured and blue just for that, I might have actually noticed it looking different earlier.

It's been a while since I used hexedit on Linux, but I think that highlighted search results in reverse colours, just like less does for text search. Personally, I'd prefer that to colours.