I HATE when they rattle but I definitely appreciate the added safety/security on my about-town bike.
I always go without them, but they do their job when they're in place.
Nothing wrong with running one if you want.
I wonder if there's a market for CF dork disks for weight weenies?
Fact #1: Most bikes in bike stores do not come with them. So, if most bikes didn't, and don't come with them, then they're not important.
Fact #2: In the 50-plus years I've been riding bikes, I never had a problem with a chain coming off the gear and wrapping itself around the axle, so since I have never had an issue there is no reason for them. Only 1 out of my 7 bikes came with dork rings from the factory, and I'm not sure why it did, so I removed it.
Most dork rings are plastic, they will discolor and crack and look like crap; some are chrome and are heavy; so why have crappy-looking and or heavy dork rings if they don't serve a purpose?
Wag more, bark less