You are speaking of one class. Not all classes. You should see how many people in all shifter classes who are in good shape and slim that have to spend too much time and money on titanium, carbon fiber and custom aluminum parts just to get CLOSE to the minimum weight. Don’t misrepresent data.
Take weight off and shrink fields. Sounds like a great idea. Buy an electric kart stand. I haven’t lifted a kart in years. Work smarter, not harder.