Either way, I’ve seen way more people online using the Ferrari 296 GT3 than cars like the FIAT Panda, Renault Twingo, or Renault Captur. Gatekeeping or mocking players who prefer actual race cars in GT is just wrong. This franchise has always embraced all kinds of automotive tastes, and everyone enjoys the game differently. For example, my 7 years old brother got into Gran Turismo because he was amazed by legendary race cars like the Suzuki Escudo, the Toyota GT-One, and the Ferrari 458 GT3, not because of everyday crossovers like the Toyota C-HR or the Peugeot 2008.
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That doesn't mean everyday cars shouldn't be in Gran Turismo in favor of race cars only; your hostility toward them is honestly "WTF" especially since you know full well that Custom Races exist, so it's not just a matter of their online usage being limited...
EDIT:
No hostility here; among the cars I mentioned, the only one I don't like is the Panda, I like all the others, even the C-HR! 😂