You can want any car to be added to GT7 without comparison to any other car, but the most relevant factor is if a similar car is more popular among GT7 players or licensing more difficult or other aspects of comparison to other cars. One good example is the Ferrari F80, it's very similar to FXX by class or type of car, not so much by looks.
Same goes for AMG One. We already have the AMG VGT road car. The AMG One looks better but is the same type of super car, & since there is always many more cars to want for inclusion in GT7 than what we can get then the question be put to the poster who wants a particular car why exactly is it better than the most relevant "GT7-potential-inclusion" alternative?
I'm sure you agree that the WEC car or at least hypercar rooster in GT7 is almost full & complete, at least for 2026. This wouldn't be the case if not for the 4 GRAND WEC cars a short while ago..!! Which is all about comparison & relevance to similar cars.