I agree with all of this. My favorite horse was a cribber, but while he’s enjoy taking a nibble on the indoor or a fence when his collar was off here and there, his behavior was remarkably reduced when he was turned out in a large field by himself, with lots of interesting stimulation (near a road, lots of up and down, trees). So I would have before been in the “go for it, get the cribber” camp, until I later met a nervous pony–poor thing, I felt so badly for her–that cribbed so determinedly it was hard for her to get enough calories in to keep her weight. When I rode her she also was prone to nervous, er, liquid-y pooping.
I’m sure her diet and environment was badly managed, but it helped me see there is a big range of cribbing behaviors, and a horse that loves cribbing above all else may have other issues going on.
I’ll also agree that it makes boarding challenging. I noted that the horse I loved had a collar, and I simply had no choice in the matter, because the boarding barns required it. I would even get an angry email from the barn owner if she didn’t think I’d tightened it sufficiently. Even a less-than-determined cribber does cause damage. It might not be a big deal to a horse owner with a few horses in the backyard, but I can definitely understand if it wasn’t my horse and my expensive wooden fence or indoor at my professionally run operation had teeth marks in it, I’d get upset. Also, the noise can be annoying to staff who are around the cribbing horses all the time.