I missed to say: What oversteer modern cars have so much grip they dont just spin out
To be honest I think simracing is a very good preperation. If you are a good simracer you know what to expect from the car, you are able to analyze diffrent lines and one big factor for is, that you can be very critical about yourself. For example I am not the best driver in really underpowered cars in simracing and I have driven diffrent Karts (still very slow onces) in reality and I struggled the most in the once with the least amount of power in terms of pace.
Another thing is, that when you jump into a Kart for the first time your driving (at least mine) is driven by your survival instinct. I find myself taking shallow lines and not using all of the track in a Kart, but then I have a critical look at it and apply the lines I objectively know are the best and try to stop taking the "pussy-lines", which another part of my brain wants me to take.
The first time, that I drove a kart was at around 20 years and I do it maybe two to three times a year know, so I always struggle with these basic things, that maybe other people don't struggle with when they start fairly young, but my simracing experience helps me to improve myself and the mental part for me in real life is fairly easy and I actually find it a bit easier to stay fully focused compared to simracing.