In addition, as requirements get more complex and users expect more polished products, we end up relying on more and more open source/reusable infrastructure an

In addition, as requirements get more complex and users expect more polished products, we end up relying on more and more open source/reusable infrastructure and libraries. Those tools allow us to not reinvent the wheel and accomplish more in the same amount of time, but they also add to the complexity of any software system. House building has become somewhat more complicated over the years as building codes are made stricter and new techniques are developed, but for the most part it is just a switch to a new way of doing things vs. in the software world where we will continue to pile on more and more levels of abstraction, but can't reasonably expect to have at least some kind of understanding of the underlying layers.