I haven't had any problems with my dogs chewing fabric crates, but I have had failed zip fasteners, (at an outdoor show too!), and tears in the mesh panels - from my dogs using their feet in excitement. I have also seen these crates roll when being used outdoors for large, bouncy dogs. I think these must be the reasons why the KC appear not to be fond of them. I am well into my seventies, and would love to be able to pack less weight, but unless it is a breed show, in a hall, I do feel happier using a metal crate. I have moved on to the lighter black ones though. (My dogs usually travel behind a tailgate in the car).
I only use soft crates when I am stopping out for the night like crufts, and only so they are contained in a crate when I am not in the room with them, travelling they are in metal crates at shows a dog show trolley