Assuming I made this stuff. It is useless to have smart rings do the primary stuff of what a smart watch does, so not monitor your pulse or that crap because anyone who has a smart ring should have a smart watch for that and the few people who don't want smart watches but do want smart rings would be such a small outlier group I wouldn't care.

The only way the concept of a smart ring makes sense to me is as a form of gestural navigation/usage for real world or virtual world inputs that would be similar in affect to media presentations of superpowers/magic.

Thus, with my smart ring I can walk towards my office and make the open gesture before getting to it and the door opens for me and I don't have to do the other stuff. I can make the open gesture but contact security also and it opens but contacts security.

I can make the close all the doors and lock the house gesture and only the smart ring open can open them etc.

Login open computer, I am using smart ring of course it does it.

Refuse to login open computer not using smart ring (obviously this has down sides, everything does)

Using smart ring but not you, give fake access computer in sandbox, contact security.

Obviously gestures would have to be customizable via your other smart world devices and computers and so forth. The benefits of an integrated platform.

Before anyone laughs at continual contact security. Smart ring is luxury and anyone who pays for that crap has enough money to pay for either personal security or at least an on call company, provided by smart ring services.

on edit: note this is my idea of what smart rings should do, don't know what the normal ones do, so my idea that it should be a luxury item may not track actual situation.