Un-restored cares are welcome on the concourse only if they don't need restoration (with a few rare examples to the contrary). Generally cars should be in a good state of repair. Even 'unrestored' cars have new batteries. Some have new pistons! All have rebuilt brake systems. And dents are not considered patina
In cars the differentiation is more between original and accurate and fo-fo cars (custom jobbies - not considered real cars by many ).
A respray if done in original colors is accurate. But it is not original. However, try and find a show car that has not been resprayed at some time. Paint was not meant to last 40 years!
But this is just the top end of the market. I was more of a bottom feeder. At that end of the market you see frankens and butcher jobs all the time