Personally, I haven’t run into a situation where I could only configure something via UI. There’s always been an option to toggle between a UI editor, and just a text editor for the appropriate YAML. There could be exceptions that I haven’t encountered, but they’re definitely few and far between.
Hmm, I would only purchase them as a third (or more) layer of redundancy, or maybe for storing things like ripped media that could just be re-ripped (or re-torrented) should the drives fail. I would not trust them for anything important since you have no idea what kind of environment they were in for all those years.