There isn't any real advantage to running an expensive LiPo or and expensive ESC in a blinky class - the problem is that people see the fastest cars running those parts and perceive it is the electrics, whereas really it is the time spent in setting up the powerplant and the skill in driving it.
I don't think that 1s 13.5 GT12 is particularly fast, it is still a driveable class for all the abilities I have seen trying it.
In touring, I don't think that 17.5 2s is too fast either. All abilities that I have seen can cope with the cars, yes there are some very fast cars in the class but again that is down to time spent on prep and driving rather than the superiority of any particular electronics.
Technology hasn't made RC too fast or too expensive. Brushless and LiPo have actually made the (longer-term) costs far cheaper. The cars are a good speed - it is people that make it expensive!
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