@BeExcellent and
@zekko, they are actually all good war movies. For example, there was this one time, I watched Darkest Hour, but paused it half-way in the movie where I felt the movie was beginning to overlap with the time-line of the Dunkirk movie, then watched Dunkirk, then resumed Darkest Hour and that was like a *wow* realistic war-time re-enactment from both sides in that story.
1917 deals with WW1, and one can argue, so does Fatima (2019) - the Portugal apparition of Mary during WW1 which provided hope to a population in despair because of the extent of the military losses and you had three children lifting the spirits of many small villages around with a story of hope. They really haven't made allot of nice movies re-creating the times and period of WW1 that captured my interest apart from those 2. There have been others, but they have been rather boring (Passchendaele 2008). It's like Hitler and Pearl Harbor makes WW2 have some sort of Hollywood status because of the crazy ideas, advanced time of warfare that was fully used, that is simply seems more sensationally portrayed compared to WW1.
Before 1917, what did we even get recently? WW1, is often portrayed as a backdrop in some romantic movies (ie Frantz (2016), etc... or Christopher Robin's inspiration of Winnie the Poo (Goodbye Christopher Robin 2017), so it was a badly needed movie to at least put WW1 in the cinematic map.