Because I do not like PC gaming - my gaming rig pretty much collects dust in preference to my Series X and PS5, and I also HATE using keyboard and mouse, so when I have no choice but to game on PC then I want to at least be able to use a controller to lessen the "suckiness". Believe it or not, there are MANY of us that prefer controller to keyboard/mouse.
Besides, no controller support on an FPS in 2022?!? Lol, yeah, right....