Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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Which can all be roughly translated as “more like math”, which is not such a compelling argument if you aren’t doing math
But that's the point, isn't it? FP is about making programming more like math. It's natural to pick examples from the math domain, where the contrast is most obvious. I guess I'm not sure whether you're against the reasoning or against the choice of example.
For a non-math example, I like UI programming. e.g. jQuery spaghetti where DOM is treated as mutable state separate from the data (also mutable state). Easy to have state mismatches. But React/FRP goes a long way towards solving those issues.
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