I haven’t seen one go pointy. The Superstar one on my hardtail just started throwing the chain off when it was worn, it didn’t actually look too bad. All the other NW rings I’ve had have been steel and seemed to outlast the bike.
It’s the 2 broken teeth that worry me. Literally just riding along the road and the chain started grinding on something. The chainring was pushing it off the bottom. Only last about half a mile before going quiet again. I guess that’s when the teeth fell off. I don’t think I’d hit it on anything!