Future Samsung Galaxy Rings could do more than just track your health, they may also let you control other devices with a flick of your finger. A newly published patent suggests future versions might enable users to scroll, move files, and transfer data between connected screens.https://www.notebookcheck.net/Smart-ring-s-evolution-Samsung-Galaxy-Ring-could-command-your-tech.956966.0.html
For me this is enough to explain the lack of bluetooth on Galaxy S25 Ultra S Pen.
Maybe they just lost the timing to release those features to the first RIng ou a new Ring.