Letterboxing when playing 21:9 (2460x1080, 3440x1440)

It gets very annoying needing to stretch by playing on 16:9 aspect ratio. Only way to fill the screen is to play at proper 16:9 stretched, but then it gets blurry and puts me and many others at a severe disadvantage.

Same problem, lobby is fine, but menu and in game after parachute seems like its hard coded to 16:9, I lose 33% of my screen and its nauseating.