Here’s a couple posts with my take on the whole thing. Fingerprinting a specific user or device without them signing in is complex, not 100% reliable, not 100% foolproof, and not secure as stated above. Even using the CSS Library app as an example, it seems that it often forgets who I am whenever I visit the page and have to register each time. I would love to be able to identify a specific device for one of my use cases, but the only reliable options I have are to have a separate sign in or a separate app for that device.