[userbinator]

Would you say the same about Chinese, Japanese, Korean, or some other non-Latin-script human language?

Just because it's not some C-derivative language doesn't mean there aren't those who can read and write it well.

[dbcurtis]

No, not that at all. It is more a reflection of APL’s extreme density. C-derivatives tend to devolve into ASCII-salad, which is no better.

Also, with APL, the code for something that can be expressed in linear algebra is reasonably natural, but when APL gets used to code other things it can be hard to reverse out what the author was thinking when they found a linear algebra expression of a problem for which that is not a natural mapping.