APL is not unreadable any more than mathematical or musical notation are. Sure, to someone who doesn’t know the notation it looks like an incomprehensible mess

APL is not unreadable any more than mathematical or musical notation are. Sure, to someone who doesn’t know the notation it looks like an incomprehensible mess. So does math, music, greek, chinese, arabic, hebrew, etc. I used APL professionally every day for ten years. I can read it. I can touch-type it. And I don’t need a specially-labelled keyboard (even thirty years later). This should not be surprising at all. A pianist does not need labeled keys and people familiar enough with the above-listed spoken languages can touch-type them without much effort. While, sadly, APL has no practical application in modern software engineering (it stagnated and became irrelevant and impractical) it is wrong to look at the brilliant use of notation as a tool for the concise communication and expression of ideas and list it as a negative. Not being able to speak, read or write Chinese does not make it a bad language.