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Actually it's a very good example.

Is 中 a word? Or 中國 a word? Or 中國哲 is a word? One can't say until they read a full sentence, making sense of it and distinguishing words from context.

Similarly, can you clearly distinguish operators here ",`(({.@] , ($: }.))~` ({.@] , ($: }.)) @.(>&{.))@.(@&#)"?

Sure, we can acclimate to a lot. Assembler is also a language. But nobody gonna write Hacker News in it.

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Don't mistake looking complex for being complex. These languages have very simple and clean grammars (or they'd fall apart quickly), which is quite a contrast to the dog's breakfast that is modern C++. A simple grammar = simple to read once you've learnt the syntax. There's no issue in having a lot of symbolic operators if they all work in a clean and consistent way.

Unfortunately, J's grammar isn't the cleanest. It uses juxtaposition to mean about a dozen different things depending on whether the tokens are data, first-order functions, or second-order functions and how many are juxtaposed. A variable could stand for any of these. If there are variables in the expression, you have to know which variables stand for which kinds of objects in order to parse the expression.

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