I don't have a problem with modern pocket cars, like the Yaris and the Jazz. Still are tall little front wheel drive squirts. I agree on booting 1/12th saloons and door chocks. And limiting the bodies to Tamiya genuine articles is a bit restrictive, considering the tiny amount of aero advantage in the general shape of these bodies is practically irrelevant. Also, availability and freedom of expression is what's important, as well as keeping bums on control towers (keeping people interested) It's keeping the appearance of these as a 1/10th sub 1300 cc mini car class is what is important (to me).
I've put a Chevron Monster Mini* on mine, because I think it embodies Mini racing, but I know a few clubs would send me packing. I have left the wing off (so far), until I start racing again, and see what's allowed.
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