The X-shaped glyphs that appear on-screen whenever you harm someone; how important are they to you? They do feel nice, and they're very convenient if you can't see what you're hitting. I only just noticed that they've been around for a long time (both Battlefronts and CoD: Finest Hour had them) but they seem like a necessity nowadays; even mobile shooters have them. Are they used for anything besides player information? Do they help check for lag, etc? Or are they just a polite convention, like parsley?