[rapjr9]

One of the problems with abstraction is that while it hides complexity, it makes changes that must reach into that complexity difficult. Abstraction is great if the code is never going to change again. If the people using the code want new features, then abstraction is a barrier. Getting around the abstraction barrier makes the code more complex. You have to think about the entire life cycle of the code, not just what looks pretty when you first write it. Most developers have no idea what their code will be used for 5 or 10 years into the future. As an example people have been trying to abstract away the complexity of network connections for decades, without a lot of success in keeping the complexity hidden. Someone always needs direct intervention in a layer in the network stack to make their product work right.