Can't speak clearly for DCS, but for the past 15 years was heavily involved in racing sims, iRacing rF2, ACC etc...In racing sims the sim racer always goes over the edge first, crashes, and works backwards. The real driver works slowly up to the limit, for obvious reasons. But the fidelity of racing simulators is clear, especially if they have a good tyre model: there is a one-to-one correlation between what inputs you put into the real race car and the inputs you put into the wheel and pedals of a simulator. That was what triple Le Mans winner Darren Turner (who also runs a pro simulator facility) told me once.
Three years ago I was lucky enough to drive a real life F1 car - Kimi Raikkonen's Lotus (Renault) from 2012 - amazing experience. What sims taught me was learning the track and knowing how fast the scenery flies past you. In my very brief experience I didn't even warm the tyres up If you're interested, how I got on is in the link below: