What is the advantage of a rear engine car?

For some reason American drivers seem biased to understeer and the Corvair’s oversteer, in its original design, was a disaster when sold as a family sedan. And GM went so far as to build a Corvair wagon. The car was a lot of fun to drive in its day and the pickup version might have been a workable vehicle but the entire concept was trashed by “Unsafe at any Speed.”