Today, many people who study Latin describe it as a hobby. For others, it is much more.
As recently as few hundred years ago, anyone in Western Europe considering a career in academia, or diplomacy, or anything else which involved constant contact with an international group of people, had to have a good grasp of Latin. They had to be able to read it, write, and speak it at least a little, and preferably more than just a little.
And therefore, anyone today who wants to read about any of those people, about Elizabeth I of England, or Wallenstein, or John Milton, or Martin Luther, is only going to get so far without needing to be able to read Latin.
Western philosophy from Lucretius to Decartes, Spinoza and Leibniz, and a not inconsiderable amount even more recently, is in Latin. Catholic theology until 1962, and a great deal of the earliest Protestant theology, is in Latin. Newton Wrote about physics in Latin, Gauss about mathematics, Linnaeus about biology. Francis Bacon, Galileo, Hobbes, all wrote in Latin.
You might object that all of the people I've named so far also wrote in other languages, and you'd be right, although just barely in the case of Spinoza. You can read works in their original form by all of the above without knowing any Latin, although only a very little work in Dutch by Spinoza.
But go back another few hundred years, and many of the leading minds wrote only in Latin: Roger Bacon, William of Occam, Thomas Aquinas, Gerard of Cremona, Albertus Magnus.
As did the historians Gregory of Tours, Bede, Einhard, Nithard, William of Malmsbury, William of Tyre, Matthew Paris, Henry of Huntington, and many others, including many anonymous chroniclers, many of them good writers, many famously bad, but all of them writing in Latin.
Church records, baptisms, marriages and funerals, inscriptions on tombstones, public buildings and currency. Government archives. Compendiums of laws.
And then there is the ancient Latin which remains, relatively small in quantity but generally very high in quality, which we call the Latin Classics, read, quoted and emulated by all of the above. Especially in the Latin Renaissances of the 9th, 12th, 15th and 19th centuries.
And I mustn't forget to mention all of the Latin poetry and plays and fiction written since the ancient era.
And is a 21st century Latin Renaissance already underway? Some seem to think so. The number of people going to the trouble of learning to speak Latin, not just to recite it but to engage in spontaneous Latin conversation, seems to be rising.
As I said, for some, Latin is a wonderful hobby. It does nothing but make them happy. But given all of the above sorts of Latin available today to be read, it seems to me that a writer could make more than a hobby of it. A poet, an historian or a philosopher. Yes, for many different sorts of authors, the above-listed sorts of written Latin could offer more than just a hobby.