As the Stencil Group points out, moving to a modular system has great benefits:
Now, if you were to look at the back side of the 'modular system' you would notice that there are wires running in every direction, hooking all of the modules (or services) together. If you've ever had to wire together the components in your stereo system, you know what kind of nightmare this can be.
The neat thing about monolithic systems is that they don't expose the ugly wires to the outside world. Of course, there is a huge downside in this approach as well - you're stuck with the whole elephant. The goal of orchestration is to get the best of both worlds: the flexibility of a modular system with the simplicity of a monolithic system. In most enterprises, you won't be dealing with a small handful of components, it will be hundreds, if not thousands of services that need to come together. Imagine trying to wire a stereo system with a thousand components...
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