Pretty sure I've raced a Le Mans car of any type more often then I have a Prius.
And I'm sure that someone out there has done the opposite. It still doesn't have anything to do with usefulness though. Both the Group C car and the Prius can be raced, tuned, drifted, whatever. They're equal in terms of usefulness. Every car is (except the F1's which are unfortunately restricted in GT5).
But then again, only absolute 🤬 will drive around in an X1 messing up the game for everyone. IMO it shouldn't even be in the game, or even so, it should be a "Special Car" like in GT4 where you can only use it in a time trial.
The point was if you're using speed to justify what's fast, then why not just oust everything but the faster car?
And no matter what car is in the game or isn't, people are still going to ram you so the X1 is not at fault there.
The X1 does not mess up for the game for everyone. It certainly does not for me. Nor does it for the people who race them or try to set lap records with them.
Nothing should be a special car because that is just a pointless fun killing limitation. You have plenty of ways to avoid a car that you don't like. Removing content from the game for petty and irrational reasons is just plain unacceptable.
Show me one Spot Race/Online Racing Events Series thread that has at least 6 people participating excluding the host and I'll believe that the Prius is worthy to be in this game.
I bought GT5 to race around tracks in my favourite cars and to burn rubber, not to save on petrol that doesn't exist in real life.
I won't show you any spot race with an arbitrary number of participants because that again has nothing to do with worth. There could be just one person who cares for the car at all, and that would be enough justification to consider putting the car in game.
I'm sure many people bought GT to race their favorite cars and burn rubber. Some people might do that in a Prius, and I doubt that you have any idea how many people would. Your preferences are not universal.
I don't want to see any of the "Gran Turismo" LM cars. You didn't really make the car, you just typed some letters/ numbers in your computer and assumed that's how the car would perform.
And to the accuracy of GT's physics engine, they are as realistic as all the real cars. The car does not have to exist in reality to be realistic. A simulation works by replicating reality. Those numbers typed into the computer are all you need to make a car (including the real ones) and they aren't just pulled from thin air (hopefully).