More cars the better. I've always been a fan of Gran Turismo, especially GT2 and GT4 because of the absurd high number of cars and also how unique a ton of them were. GT5 and GT6 was meh for me because while the car list was high, it had PS2 models in them, that's just unnaceptable.
Still, if we want extremely high detailed cars like the ones we have now, I am more than happy to wait for more DLC cars even if it takes a while. Quality over quantity always.
However, the OP has a point. The game really lacks newer 2021-2022 cars, and a game released in 2022 shouldn't have such absurdly low numbers.
And not only that, but it also lacks iconic cars in real life that the series had in the past.
-The New BMW M3 or M4
-The New Porsche 911s (although to be fair, PD will almost 100% release the new GT3 or the Turbo S in the game considering how bang on they have been with Porsche, but again, it should've been at launch).
-The New Ferrari SF90
-The New C8 Corvette (again, PD will definitely add this, as they usually are pretty bang on with Chevrolet)
-The New Maserati MC20
-Newer GT3 cars...
And a ton of other cars from regular consumer brands, even japanese ones, that could've been in the game.
^And this just off the top of my head and from brands they have in the game.
And if the game reaches it's lifespan without some of the older cars appearing in the game it's just criminal, such as:
-Lexus LFA (I am shocked how this car, one of the japanese marvels, was not featured in this game at launch and it had appeared in GT5 and GT6)
-Porsche 918 Spyder AND McLaren P1 (it's a must to have the Holy Trinity hypercars in the game. Heck, even make an event with them or a mission, I'm also pretty sure the 918 Spyder will likely be added to the game, and we already have the P1 GTR so it's not far fetched to add the regular P1 when they've added both the LaFerrari and the FXXK)
-Toyota GT-ONE TS020 (another japanese iconic racing car and iconic in the series itself)
-Suzuki Escudo (iconic in the series, probably the car most people associate Gran Turismo with)
-Lancia Delta S4 (we have the Audi Quattro and the Peugeot 205, only the Lancia left to have the big 3 monsters of the Groub B era, plus this car was featured in GT4-GT5-GT6 as well)
-Lotus cars (Esprit and Elise, which also have a huge fanbase and the series add them in most GT titles in the past, in great number at that)
-Red Bull X Fan Car (let's be real, this car was THE feature of GT5-GT6, and was made with partnership with Red Bull and is EXCLUSIVE to the series, to show the pinacle of what a formula car without restrictions would perform at, if we already have the Standart Red Bull X cars and we even have something as ludicrous as the Tomahawk X, why don't we have this car on the now heavily improved physics in GT7? It's not a must have, but it's a car that should not be neglected)
-Opel cars (Calibra, Speedster, Astra...)
But let's be positive guys, just look at it this way:
Gran Turismo Sport was released in October 2017 and had 168 cars.
By December 2019, with several updates while they were also focusing on a lot of tracks as well for the game AND while developing GT7, they released 156 cars to tally the count to 324. Again 156 cars (and quite a few tracks) in just a little over 2 years.
Now, with no game to develop as the MAIN title has arrived, they can focus almost all of their resources on GT7.
We can expect easily over 600 cars by 2024. And on top of that, all of them with the careful attention to detail we know of.
Let's just be patient. Plus EVERY car has it's fanbase, so obviously it's going to be impossible to please everyone. But I for one don't want the cars to end up looking or sounding crappy just for the sake of having quantity in the game. That's just a repeat of GT5-GT6. And most of us (at least I hope) don't want that.