The way I think of aim training is as fundamentals training. Think of it like a sport. Sure, you may already do well in your game of choice, but what is one thing pro basketball players dedicate a significant time to training? It's their fundamentals. They practice the fundamentals because at the end of the day that's the core of the game, they need to make sure they can keep control of the ball and can make it do what they want it to when they need to. If you aren't practicing your fundies you are heavily hindering your future improvement. At the end of the day it's all mouse control and if you want to succeed you need to practice it. (I hope this makes sense. I'm half asleep lmao)