I don’t think a game has released with over 1000 cars using modern assets.
GT5 and 6 had 1000+ but 3/4 of the list were ported PS2 assets with minimal if any adjustments.
I don’t know if any Forza game has gotten up to those numbers with post-launch support, but they’ve certainly never launched with 1000 - and they’re the ones known for having an outsourced modeling crew. It’s a bit insane of an ask for GT7, especially knowing the pace that PD seemed to be able to add content to GTS.
Polyphony finally started to outsource as well which is never a bad move