Like stated, no not every car will be considered. The majority of cars that are run on a regular basis is the base foundation of what the "Norm" is / should be. I only mentioned the Tamiya's because some people are die hard and love them. For the money they are great and you could get either down to weight if you actually wanted.

Shoot I started 17.5 with a plastic over weight TA06 & learned from there, I picked that car I had other choices as does everyone. Still did good with it considering it was terrible for most people, learned set up, stayed off the boards did well and moved on. The point is when you see Usgt and the cars running in it you have a great picture of what the class actually is. If a new comer walks into any local on road track one of the racers if not multiples will help guide a newer racer to a worth while chassis / help them get going.