Totally agree, IF an AGI can fully replace/improve on the work of developers, it's definitely cheaper.
But: 1/ cheaper isn't always affordable either.
2/ who will engineer/maintain/steer AGI once AGI takes the job? once you make that leap, there's no way back, no one to understand the machine that makes the stuff we rely on.
And that circles back, in some way, with the debate about AI-generated art: there's no human component in it, there's no understanding, no feedback loop, no conversation.