I'm not saying bigger cams don't have their place, if want a 1000hp at the wheels then obviously you're going to use a fairly decent sized cam but then again at those levels response isn't at the forefront of your priorities.
What im saying is so many people are fitting bigger cams in the pursuit of better down low power and improved response, perfect expample is If you have an engine that has cams that still make power at 8500 and turbos that roll over at 7000 how is bigger cams going to be a benefit?
My findings come from many cars I have worked on from 6L na v8, 2.0 4cly turbos and down to 1.3L 4cly na engines. Even rotarys with their port timing will do exactly the same thing