> Everything you said could apply to a new bridge, building, pharmaceutical compound

"Everything"? So

> predictable and repetitive tasks are also the kinds of tasks that are most easily automated, which means the time it takes to perform those tasks should asymptotically approach 0.

Also applies to bridges? Bridges require a ton of manual human input at every stage of construction, regardless of how predictable and repetitive the work is. With software, we can write software to make those tasks disappear. I've yet to see the bridge that can build itself.