To interpret the headline literally: Writing code for humans is actually relatively easy; it’s called “literature” (or “technical writing”). What’s hard is writing code (for computers) which is also easy for humans to understand. Anyone who has written polyglot code knows the enormity of the challenge, but also knows the tricks to make it work. I.e. you have to do a lot of things which means something to one “reader”, but is meaningless to the other, and vice versa. For example, variable names are meaningless to the computer, but very important to humans. And so on.
