While I agree with you, it’s obvious that PD has chosen to drip feed us content, because the metrics (as far as long term revenue stream I’m assuming), suggests they do it that way. Frustrating, yes. Reality of today’s gaming market? Also, yes.
But I guarantee you’re still going to play this game, despite your frustrations. Especially when new updates drop.
PD and Sony also know this too.
Not all today's market, thankfully. EA already said how "single player games are dead" years ago, yet we've got complete and amazing games after that did sold beyond well. GoW, Spiderman, TLOU2, HZD and more. Or more recent Elden Ring, which might have an expansion eventually, but a complete game since the release date, with zero MTX and drip fed content.
So it's only reality if a developer and/or publisher decides it is.
And you can't guarantee anything for anyone, aside of maybe yourself. Not everyone on these forums are die-hard GT fans. I was, until GT5, which was awful enough so I stopped playing it after half a year, and did skip both GT6 and GTS. To be fair, GT6 was just too late and released after PS4 was out already, and GTS' focus being on the sports mode were among deciding factors why I never bought those, too. But still, PD didn't get even 10-15$ from me for GTS.
GT7 for me right now in the similar situation as GT5. I'm "done" with the game, have all, but 3 cars that will show up in LCD soon. I don't even bother with daily marathon anymore, PD can keep their scam tickets for themselves.
I will check new update, sure, but if it's anything like the May's one, then it's "whole" 3-4 hours of gameplay in a month. Which is laughable amount for a game that is supposed to be the GaaS type. 2-3 more of such updates and I'll just clean out space on SSD for something I actually play. That's what I did with GT5 back then. Will I buy GT8? Maybe, maybe not, but most likely not if PD won't fix the GT7 to the point it's actually somewhat close to what they have promised.
And to be clear, I've got 70$ worth from it time wise as it took me quite longer to get to this point than some single player games I bought for the same price and which were like ~10 hours long. Nor do I really care about how much it was, it was more of not being happy with the direction series is taking and voting with my wallet.