Speed is undeniably one of the best technical factors a MoonKart Driver has to offer. Other factors include Health, Handling, and Accelleration. Three of the four are important now. This is why Vortex for me is the best driver in MoonKarts. Consider these stats:
If you look at the top racers now, jorissino, sillusix, etc are using this Kart, mainly because it provides the fastest speed. One of the key things on MoonKarts is always the Speed, the faster you are, the faster you get into finish line, which means a better position for you in the rankings. As a result - better rewards.
In the next few days, new season will emerge and players will battle again to the rise in the leaderboards. I'm excited to see how the game will develop. Eventually, I am thinking we are having a better balance between players now. Looking at the history, I think it is perfectly fine to still be into the game.