Please stop with these false equivalencies.
As much as I hate to admit it, FH5 has a bustling economy in comparison to GT7. You can make money tuning, painting, selling cars in the auction house, and reselling duplicates back to the dealer. Amazing detail, that. Surprised it's never been in a GT game before. Oh, that's right, it has but isn't a feature this time around because...reasons, I guess?
Anyway, no one is talking about playing the game for months to acquire every single car. I've literally never seen one single person here claim that. What I have seen is that it could take that same amount of time -- joking or otherwise -- to acquire one (1!) of the more expensive cars because GT7 doesn't have an actual economy because it's designed to push you toward purchasing credits. Running the race multiple times over because you have no other choice is an order of magnitude different than running the same race multiple times over because you want to.
Also, FH5 throws money, cars, clothing, emotes, taunts, sneakers, etc, etc at you like they're going out of style.