In all honesty, as long as the car is mechanically sound and clean, that's good enough for me. I've had several cars from new, never had an issue with prep. Got far more important stuff to worry about that a few potential minor swirls in paint that will inevitably get some combination of chipped, scratched, dented, shat on, and all manner of abuse during its life! I do look after my cars, but I don't nanny them.