For those wanting a TL;DR: The main suggestions by the author are in section 2. Essentially, it says that modularity allows any errors to be contained, conserv

For those wanting a TL;DR: The main suggestions by the author are in section 2. Essentially, it says that modularity allows any errors to be contained, conserved design-by-contract interfaces allows for system expansion, and encapsulation allows for new layers to evolve more freely while older systems stay conserved.