I have been a car enthusiast for well over 50 years, anyway all the Gran Turismo numbered games are good that I have played, until a game called GT7 which is not a true numbered game. It is missing a lot of good thing from a numbered game. You say it is accuracy and replicating real world motoring well no it is not, because some things in the game are not quite to the real world standards.
Let's take for example the Performance Points in the game, Performance Points should not effect the Suspension, LSD, Transmission settings and the tires as well. PD should never have done this because it's not real world system, and they want to call it The Real Driving Simulator then they should scrap the idea, of PP effecting the Suspension settings side of things.
Oh yes, they absolutely should. It's possible to unlock
seconds in a car's lap time with a good tune. Maybe downforce shouldn't, because it depends on the track.
Also I'm sorry to break it to you but physics accuracy absolutely matters today and is why even main rival of Gran Turismo (the much less popular Forza Motorsport) is set to move to a more realistic physics engine. This is not the early 2000s anymore, GT4's inner workings don't cut it anymore. I'd even say this is the main reason why Codemasters keeps failing to resurrect GRID: a track racer with generic, arcadish gameplay, good for 2008, not for today. It was also the reason why NFS Shift failed, and that one came out in 2009!
In fact, if you put every GT game ever made prior to Sport against the Forza Horizon of today, it would lose, because Forza Horizon has a decently realistic physics engine in an open world, arcade racing package that's more appealing to the casual player than GT4's event-based track racing. Forza Horizon also has way better sounds than those games, more cars that matter and is generally a much easier game to play.
When the franchise has an e-sports championship which prioritizes steering wheels, the mark of a sim, claiming the nuances in each car's behavior don't matter shows a disconnect from the market's current way of thinking. GT Sport was a shift in the franchise's priorities and GT7 is an attempt to bring what was good about Sport to a larger public while retaining the good bits from the GTs of old. In doing so, it's functionally a better game than everything that came before.
LOL GTR2 came out in 2005. Guess what even today the game has lots of mods and improvements still going strong.
Richard Burns Rally set the bar hence why its considered one of the best rally sims of all time.
GTR2 is dead. Been there, done that.
The only people who play are a fringe public who refuse to move to newer sims and the only content still being released is based on stolen 3D models from other games. That's why if you even want to get into GTR2 modding you have to dig obscure forums which approve membership on a case by case basis.
In fact, it was like that 10 years ago.