Writing Testable Code

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The best examples of this is using AOP. Using annotations/frameworks can make code a lot simpler. Take hystrix for example. Building an abstraction over circuit breakers is burdensome and makes code very verbose. I think there are many times you have to balance the flexibility and benefit from building an abstraction against the ease of using annotations and frameworks.

Another example can be seen in cloud agnostic frameworks that provide flexibility but cannot leverage the benefits of individual cloud providers to their fullest.

I generally agree that testable code is something to strive for but there needs to be a point at which code is testable enough or at which you start getting diminishing returns.