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Functional requirements can be handled easily that way, yes. Maintainability however is about non-functional requirements like low complexity / decoupling.

To me the trend seems to be that AI produce the same challenges as human did before and that the same solutions are helping. Without a good maintainable code base, AI will eventually fail to even fulfill quantifiable requirements of changes.

That's kind of the point of software since the beginning. Nobody cares about the easy stuff that can be produced without much effort and what's possible without much effort has changed dramatically over the years.