Open Library is of relevance in other languages, you have to do some research. I wanted to find out if there are publications by the authors who won the prestigious Herman Gorter Award?
This award was conferred from 1945 to 2002 often to multiple authors. The first author not known to Open Library is H. C. ten Berge. He received the Herman Gorter award in 1964. There were several authors where Wikidata did not have a link yet for Open Library.
Now consider this: what if we could query Wikidata for all the authors and their publications in Open Library?
Just a little bit more metadata about books, publications is what we need.. It is not really a big deal, only a few million additional records..
Many if not most of the books at Open Library have links to authorities like the Library of Congress. This makes it possible to link these books through the OCLC to "your library system". It knows about authors and that is what makes it possible to use tools in stead of people to enrich Wikidata and open up all that is in the Open Library for all of us.