You are taking an orange and comparing it to an apple. Us dirt racers don't run 500 miles in a single run. They don't have time to changes like we do in between runs. NASCAR pit stops are around 15 seconds. Its very hard to make changes to other components in a timely manner. So they are very limited on changes they can make to improve handling. Air pressure adjustments, spring rubbers, and track bar movement is about all the "quick" adjustments they can make. Adding/removing wedge, shock changes, adding ballast, etc. all take too long. Like i stated above, you can't compare an orange to an apple and expect it to be the same. Both fruit, both spherical in shape, both completely different.