For context, flamethrowers have been around for over a millennium. The weapons are necessary to destroy fortresses. Before flamethrowers, torches, slingshots, and other flammable devices were used to destroy things in war. Currently, incendiary missiles, thermobaric bombs, white phosphorus-based weapons, and other flammable explosives are much better at destroying fortresses than modern flame thrower. One has to wonder, is the future of war entirely projectile based?