I think the OP was talking about robotics specifically and not tasks like the one you described. Nobody can argue that for tasks like your binder replacement cost savings are enormous.
In this analogy, we human software devs are the artisanal homebuilders and the fancy LLMs are the robots.
And yes, there's quite a cost to build all the datacenters for all the AI that Big Tech believes that people will want. But as you mention, the cost savings are enormous for even despite that, and will make a much larger set of problems accessible to real software solutions, that previously either stayed on paper, in peoples' heads, or maybe an Excel sheet somewhere.