While I can sympathise with your opinions of the game/series, your ideas for change are misguided.
GT is and always will be Kaz. It is first and foremost a love letter to automobiles (or car porn if you like). All aspects like realistic (matching real world practiced) racing have always been secondary. It's more about the car experience and emotions, a more spiritual perspective, than authenticity and practicality. Kaz, for better or worse, is creating a product based on a vision that is 99% his and not much else, as would an artist (painter, musician, etc). This is not common these days in the world of products created and sold based on marketing and max sales numbers. This has its good and bad to it as anyone who has been on here reading players opinions has heard all of it.
My point is that if yoh don't find his product compelling, it is not the right attitude to demand changes, esp with PD as we all know how little they respond and communicate with the fan base (compared to others). If you want a game where something is more to your liking you will have to let go of GT and support other games that respond to fans more or are making a game that has potential. PCars, for all it's bugs, would be a fair example. The more people support them, they could eventually have PD level budgets to make the game that Kaz won't.
Expecting Sony/GT/Kaz to change is futile and silly, they have no reason to. It's like a bad realtionship where you once really liked someone but they have all this other negative stuff getting in the way you wish would change, but they're not, and you have just be able to let go and move on.
That's my plan anyway.
