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Probably unpopular opinion: APL and its derivatives (including many modern array-based DSLs) are sold as expressive ways to program with arrays. In fact they are poorly expressive and are instead convenient primarily for the authors of interpreters and compilers.
Expressive is a hard concept to define precisely, but don't you think that (pathological cases excepted) it means that programs' parse trees are small? And I believe APL et al are good at that.
APL started off as an IBM systwms design notation. Felleissen is very good on formalizing expressiveness.https://www.sciencedirect.com/science/article/pii/016764239190036W …
Informally: I think of expressiveness as the (inverse) distance between the idea in my head and working code. If I have to write 100 lines to implement a tiny idea, that's frustrating. But if I can use one line, and it's just as hard to write as the 100 lines, that's bad too.
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