Each to their own. I have an Oura ring and primarily for me the benefit is sleep tracking because I can’t for the life of me wear an Apple Watch to bed, it’s just too uncomfortable and I have tried many times.
The sleep tracking managed to help me make adjustments as it showed how often I was awake, how much deep sleep etc.
Also, the HRV graph is something that watch can’t provide. Some other watches do measure HRV, but you only get a daily average, so you can’t really draw any conclusions about the shape of the graph.
The temperature based cycle tracking the smart ring has is a decade ahead of what the watch is able to do. My wife has an Apple Watch and still uses and prefers her oura ring because of the cycle tracking
It’s more accurate than other thermometer based cycle trackers mostly because you never take it off and it gets significantly more data points throughout the day at very consistent intervals than something like the Mira or into.
I dont know i have been waiting for some nerd to build a wand vr controller or magic controller rings because just the premise alone tickets my fantasies.
Impractical maybe, i just want someone to try and publish results.