i'm not looking for anyone to agree or disagree with me when I say, Every thing was fine until Gen2. COTF did the job. Problem was when Nissan didn't get any help to be competitive. Teams were happy with the tyres(of course the Falcon's switched on with the harder compounds).
VASC were again too slow in giving teams time to decide what they'd run for Gen2. New regulations are supposedly coming in 2020/2021. It's still too short of a notice to put anything together. A team would have to do like what Volvo/GRM did. Prepare an extra year after regulations are handed out to teams. It's worked for DJRTP. They saw what Holden did and just came out better. Nissan are out with the weeds. Most race series use/present new spec cars. I'm not talking about teams. I'm saying new(spec, evolution) cars.
Super GT: every manufacturer uses a new car(yes, yes, Supra is coming next year), DTM: every manufacturer uses a new car, BTCC: every manufacturer pretty much uses a new car, W/TCR, every manufacturer uses a new car, NASCAR: every manufacturer uses a new car. VASC can't be having 5 year old cars running around and just updating shocks and tyres.
Now, I understand the Mustang is fresh for 2019(probably another reason Ford waited to join), Commodore was all new for 2018. However, The other series I mentioned, make sure all manufacturers line up with their latest.