I don't see it as a big issue. For a start the ultimate performance difference between the different layouts isn't always as big as you might think. It's just one of many things people can put time and money into.
I don't think trying to prevent it with a one chassis rule is practical. The rules for the class could be tightened, say to fix the motor location in relation to the wheels, but personally I think this would be a shame, the variations are really interesting. It's amazing that such a mature class has such a wide variety of chassis designs.
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