In this [url=https://youtu.be/QDr6HU-2cgE?t=4m55s]linked video[/url] you can see that after reaching level 20, the experience progress bar essentially turns into a way to see how close you are to attaining a Mote of Light. Now, I completely understand why some players wouldn't want to see it, it may be distracting for them. However, I would love to see a toggle that would allow you to keep a progress bar at the bottom of your HUD.