Thanks for that completely unhelpful response. What I wanted was specific help about your extension but obviously that’s too hard.
I searched for “Drop”, then uninstalled the DropEditor component — this only removed one item.
Then I selected all the JoomUnited Drop* items and got warning messages about (non-existent) content being affected multiple times before I could uninstall all the components.
Then I searched for JoomUnited and found that the Updater was still there.
This is the kind of nonsense I was hoping to avoid. You should provide a clean uninstall as well as an install procedure. It’s just irresponsible to potentially leave random outdated code sitting on someone’s site and it doesn’t leave a very good impression.
Also the tendency to create component-specific data/data locations as a kind of product lock-in (and the warnings on uninstall) is totally repellent. It’s great to think out-of-the-box but not when it puts your customer inside another one.