We're at 714 cars, I think. Limit is 750.
Assuming the Xbox Series X's Smart Delivery update gives the game a little extra longevity boost, and assuming Forza Motorsport takes a while to arrive, if Playground ends support for FH4 in 08/2021 and keeps adding 3 cars every month, content updates will end at... 750 cars.
So there's no incentive for Playground to issue an update other than the fans requesting one. I own all of the cars, including the "Welcome Pack" duplicates, but most people don't. For people who have 400, 500 cars and focus on certain types, such an update would be useless.
Personally, I would like support for 1,000 of each (cars/tunes/designs), but I'm not the one calling the shots.
May the forced induction be with you.
Alice >>>>>>>>>> Keira