On a carpet surface, a 10th scale pan car would whip a TC for fun!
I love pan car racing (I've raced 12th scale and 10th scale pan for many years), however they don't change. A rear pod, graphite chassis plate, simple front suspension, that's it.
People love "new" and with touring cars, the designs are exciting and different. This is the reason why TC's are in and pan cars are out.