I think they spent a little over a year on development. We gotta remember it's actually a 9 year old car, just updated drive train and some suspension tweaks. So far I've seen nothing that suggests development was an issue.
Everything I've found on mine, and it's been minor, have been assembly issues. Knock on wood that's all I find.
All I've found was the busted sub (replaced under warranty), and the oil being over filled which sounds like that's been a thing on Hellcats in general since 2022. I did find a couple drips from my rear diff. I put a torque wrench on the through bolts and they were all tight. Since putting a few miles on it I've not seen another drip. That may have been one of those heat cycle things to get everything happy.