That’s why I was suggesting more than one category per car or swapping categories for tags in the future Forza titles - to give devs more flexibility in grouping cars and avoid such oddities as Forza GT category (a great example BTW), where many various classes are blended and the homologation must be used for balancing races, tampering with the real performance of cars.
I’d prefer smaller categories but better corresponding with authentic classes in racing, similar to what RaceRoom Racing Experience offers (for example).