I think the game offers a good variety of head gear. It's probably just that the ones you aren't particularly fond of stick out in your mind more. Last patch offered lots of robust helmets (none of the sky pirate sets had a circlet or similar design, lots of the dungeon gear had hats...some with masks too) and Heavensward as a whole has had a lot of full head gear (like the Halonic tanking and ranged sets).