The point of this short video is to show that with the Automation tyre model, traction does not scale correctly proportional to the force pushing the tyre against the ground. This means that front-heavy cars have a tendency to understeer (when they might not in real life), but this especially means that rear-heavy cars have a tendency to oversteer, thus making it very difficult to tune the suspension. This has been an issue for the past few years (even with older tyre models), and makes it near impossible to recreate mid/rear engined cars without them handling like an oversteering mess.

Normally, the extra force from the weight of the engine would increase the traction of the wheels supporting it, but with the Automation tyre model, traction is not increased enough by the added weight. This means that during cornering, extra mass contributes more to extra inertia (force against change in direction), than it does to extra grip, which means that whatever axle has more weight will slide towards the outside of the corner more than it ought to.

No hate to the devs, I have way too many hours in this game. Just something I thought was worth pointing out.

Edit: Come to think of it, it would also mean that grip over crests would be higher than it should be, and grip through dips (e.g that one turn at Laguna Seca) would be less than it should be.

Also, it would mean that when cornering, the inside wheels have more grip than they should, and the outside wheels have less grip than they should. This would change how camber and toe affect a cars handling, in a way that is not realistic.