Originally Posted by
Sixty Fiver
People have been using the threaded cog and reverse locking since the very earliest days... old coaster hubs also use the same system and are constantly subjected to back pedaling to engage the brake.
99% of the failures are due to improper installation.
In this case the hub was probably a POS and bet it falls under the category of people trying to make a part as light as possible to save a few grams of weight.
I'm not sure how old a coaster hub you're referencing, but the ones I've taken apart cover a reasonably broad time range, and have all had some sort of splined cog.
I basically agree that most failures of the reverse-thread lockring system are due to improper installation, but I'd call that a weakness of the design: it is too easy to install it improperly.