> Some things are hard to express in code even if you know exactly what you need to achieve and you know all the basic moves like loops and if statements.

Like what? Are you, perhaps, confusing "hard" with "time consuming"? Some things take a long time to express in code (absent AI, at least). It's not hard, though. It's just rote copying down what you have already determined "what needs to be programmed". Getting to the point where it is just rote copying can be difficult, but is decidedly in the "what to program" phase.