When I was in 4H, I remember this one girl waited forever to clip her rabbit’s nails- as in there she was the morning of fair before showing her rabbit trying to clip his nails. They were curled, but curled sideways so his feet were still flat, but his nails, once trimmed, were still sideways. Of course, because she waited so long to clip them, the quick was farther out into the nail and she couldn’t trim them as far back as you normally could. The judge of course marked her down because the toenails looked “ragged”. The bunny, once clipped, couldn’t walk 100% properly because his nails were shorter and trying to go back to normal position, but still long so they kept him from having flat feet.
Though not a personal story, I’ve known of rabbit’s nails growing so long that they make a complete circle and it’s difficult at that point to properly get a clippers in to cut them at all, at which point veterinary help is needed.
Not to mention breaking toenails, the blood and infection from that, getting caught on something and scaring your rabbit, etc. Oh, and the painful bunny-nail scratches!