The problem is both (1) knowing what you want, and (2) specifying what you want.

(1) is hard enough and a necessary prerequisite to (2) which, even so, is even harder than (1).

Good, documented software is the accumulated knowledge of people who (1) knew what they wanted, (2) implemented it, and (3) communicated how it works. AI can ease the building of such software but does not make the process trivial.