> Is Obsidian worth trying if one's already using org-roam and is reasonably familiar with Emacs?
What features do you need that org-roam doesn't have? Hard to say if it's worth moving on without knowing that. If org-roam is working for you, then why bother moving? If it's not, why not and does obsidian possess those features?
That was exactly my point. Perhaps a clearer, if much more verbose phrasing, would be: "If you've used org-roam before and then moved to Obsidian, what are the benefits you realize only after moving to Obsidian?"
I don't know these because I haven't tried Obsidian myself and I suspect if there are benefits they won't be immediately obvious without some sustained use.