Эволюционная архитектура. Поддержка непрерывных изменений

Amazon realized that coupling everything to one thing (whether a relational database, enterprise service bus, and so on) ultimately limited scalability. By redesigning their architecture in a more microservices style that eliminated inappropriate coupling, they allowed their overall ecosystem to scale.
A side benefit of that level of decoupling is enhanced evolvability. As we have illustrated throughout the book, inappropriate coupling represents the biggest challenge to evolution. Building a scalable system also tends to correspond to an evolvable one.