I agree (from my experience). That's mostly the fault that even with static types interface design (e.g. in Java: public methods and public classes) is still ha

I agree (from my experience). That's mostly the fault that even with static types interface design (e.g. in Java: public methods and public classes) is still hard and most developers are not good at it. For me, a lot of the Spring classes are designed very well. When working with them I don't often need to look into the source code. Very often just looking at the methods (by using autocompletion) is enough.