Check out the recommended reading articles on the right. Specifically look at https://www.bestbeginnermotorcycles.com/why-600cc-motorcycle-not-good-beginner-bike-updated
It’s harder to learn the basics and figure out everything you need to be doing as a noob if your on a bigger more powerful bike. The smaller bike is more forgiving of your mistakes. The thinking that you can speed out of trouble on the road is a bad one IMO. You should be avoiding trouble or dealing with it defensively not trying to out speed it. Thats asking for trouble on 2 wheels.