Shame Samsung decided to nerf the pen by removing bluetooth, I was one of those users who used it all the time to take photos with, now that they removed that function in the S25 Ultra I traded in my S24U and bought an Oppo instead. And I'm very glad that I did, it's a superior phone in many aspects.
You could use the button on the pen and use gestures with it at a distance. So for example I would put the phone somewhere, take the pen with me and use the button as camera trigger. Now they removed bluetooth from the pen so it only acts as a pen - while the button on it still works, it only works when the tip is touching the screen.