This was a very powerful episode. The strongest part for me was the description of Apple's developer workflow or philosophy, where you can look through the stack all the way through. When I first joined the JVM on Linux camp after mostly being in the .NET world on Win, seeing the system all the way through was a revelation, incredibly empowering.

Andreas with Serenity not only sees the system through but can modify any part of the layer to make the abstraction of each layer just right.