> adding too many layers of indirection makes changes just as complicated as if you wrote a big ball of spaghetti (oh, just propagate this field across all 10 l

> adding too many layers of indirection makes changes just as complicated as if you wrote a big ball of spaghetti (oh, just propagate this field across all 10 layers!), and that your team needs to be diligent about making changes to the correct layers. "Layers of abstraction can solve any problem in software design, except for having too many layers of abstraction" :-)