#3 – The stability (or rigidity) of the ring can loosen and become flimsy with some brandsafter using it only a few times — so it falls down easily whenever it’s used as a phone stand, and it slides around too much whenever it’s on your finger and you’re trying to type. Thi...
Apple's proposed solution is "a wearable device such as a finger-mounted device [that] may be used to gather input from a user's fingers as the user interacts with surfaces in the user's environment and may be used to provide clicks and other haptic output during these interactions." So...
I seriously doubt Apple wants to get into rings. Sizing is unbelievably fiddly. Covering 90% of the population takes about 20 fixed ring sizes. This number goes down somewhat if people are willing to wear it on any finger, but lots of people have a preferred finger for rings, ...