Even in those perfect conditions right level of abstraction may cause the system to be build with less code and faster. That being said I agree that it's alway

Even in those perfect conditions right level of abstraction may cause the system to be build with less code and faster. That being said I agree that it's always a trade off; I actually did many refactorings where I threw an abstraction level out instead of adding more of them, resulting in faster and easier to maintain code. It's definitely not good to invest in abstraction blindly.