Personally I prefer it. I don't mind the rarest classic cars being just that, rare.
The format they've got now is most similar to GT4, which most people view as the gold standard of Gran Turismos, and i like that they've used the online aspect to make rare cars becoming available a shared experience.
Really enjoying seeing all of these Amuse S2000 replicas appear now that the S2000 has become available
Not to judge anybody else's way of playing the game, but I don't know why so many people want to be able to obtain all of the cars straight away. I get that most GT fans are older now and have less free time, so I can understand the frustration in that regard, but this isn't how GT Games were in the past, and I really wouldn't like to have done, seen, tuned and driven everything within the first two weeks of the games release.
If you didn't have enough free time to play it, you wouldn't have been able to try all that the game had to offer back in the day.
I barely made it beyond the Clubman Cup when I used to play Gran Turismo 3: A-Spec as a child and the fastest car I owned was an FTO, but it was still my favourite game by far back in the day, and I'm so glad that everything wasn't handed to me on day one because I didn't have the time or skill to get it for myself.