As Gerard has so eloquently described, over 60% of Wikidata items have no corresponding article in the English Wikipedia; once we leave the “top five”, this exceeds 90%. The shoot-from-the-hip response would be: write more articles! While there is no issue in principle with this approach, it might not scale well, even with all our volunteers.
Thus, you learn that Alain Danilet was a French politician, male, born in 1947, and died in 2012. Again, at the time of writing, this information does not exist on the English Wikipedia; there is no English label for this item on Wikidata; and there is no English description of him anywhere in the Wikiverse. In the current version, a small link labeled R gets you to the relevant Reasonator page, where you can find a picture of Monsieur Danilet, birth place, political party membership etc.
The code page contains brief instructions on how you can add this feature to your own Wikipedia experience, and make use of the long, long tail of Wikidata.