Golly gee. I've been painting real cars, aircraft, and models for over 50 years.
Sure wish I'd known all that primer sanding I've done to get as perfect a finish as possible was a "waste of time".
I guess all the real-world paint manufacturers that specify final sanding of primer prior to color with 320-600, depending on the specific topcoat, have it wrong too.
Good to finally know the truth.