@fchollet: The quantity of code that devs...

The quantity of code that devs ship has roughly 10xed. But net developer productivity (value created by unit of time) is only up by a bit, if at all. Part of it is that the additional code is solving more incremental problems. A bigger part is that the new code is creating problems of its own.

This reminds me of computerization. The amount of "work" people could execute on computers increased by a huge factor, but their productivity did not. The amount of work "needed" to arrive at the same high-level outputs exploded.