I think you're lacking imagination. You're thinking of a software developing ai as a simple compiler. You also seem to think there must be a 1 to 1 relationship

I think you're lacking imagination. You're thinking of a software developing ai as a simple compiler. You also seem to think there must be a 1 to 1 relationship between a user's specification and resulting program. But a software developing ai could work very quickly , taking a vague natural language specification and giving many programs to choose from. That set would be narrowed based on a learned correspondence between natural language and completed programs, and narrowed and refined further with more vague natural language specification from the user. If the ai is smart enough the system could be only a bit more complicated to use than a thumbs up/thumbs down on pandora. or we just ditch humans and allow an ai to assess what software we need.