I'm recrafting this response to more generically speak to the subject of vehicle insurability. I work for a major insurer and for us, when it comes to covering a vehicle, doing so for a modern vehicle is more straightforward than determining whether to insure an older one. Most standard carriers (Progressive, Geico, State Farm, etc) have a complex algorithm that determines a vehicle's insurability. The vehicle itself, its location, driver's information and coverages desired are some of the major ingredients.
For older vehicles like ours, an extra step may be necessary - the vehicle's value. Typically, the owner is asked to provide a value for the vehicle and if the insurer thinks the number is acceptable, and all of the other criteria is met, then the vehicle is covered. If the value is not within expectations an appraisal may be ordered where an independent third party is asked to examine the vehicle. The owner may be asked to provide additional documentation, such as receipts for work performed, to support the value declared (called stated value or stated amount in the industry) for use in developing a rate (the premium charged) as well for use in the event of a loss. Judging sheets are not used as part of the valuation process when there's a loss. I had the opportunity to speak to one of our generalists, who handles antique vehicle claims, about this and his response was that club judging is done by folks who aren't professionals so they are not used as a source for determining a vehicle's value. Disclaimer - that's how we handle this where I work but I can't speak for the industry as a whole.
Circling back to the original question, standards should be assembled for our vehicles. If there are those who wish to use them to have their vehicle judged at a KF meet, then the opportunity should be made available to them. In years past, emphasis was put on judging and folks spent a lot of time prepping their cars for the main event. Today, the emphasis should be on the gathering of folks sharing a common interest in the cars who renew old friendships and make new ones. If the parking lot is full of KFW vehicles and some of the owners want their cars judged, that's great, and if it isn't that's OK too.