Was I wrong to create relations?

There’s no right or wrong way of doing things, but some work better than others.

I think that what you’re looking for is this:

When designing things, you can’t get everything as desired on the first try. What I suggest you to do is experiment.

One way of doing this:

  1. export your space and import it in other one, that can be used as a sandbox.
  2. try something else, by creating movements and such as types
  3. don’t hesitate to create temporary sets to mass-modify your content
  4. evaluate if it’s going in the direction you hoped for
  5. trash the sandbox space when done

In this (official) video, the user reworks her whole space this way. It’s a tad old, so UI may have changed.

In my case, I often use object relations instead of select/multi-select, it all comes to “may I want to add content to ” and “do I want to see backlinks to ”.