I thought I'd illustrate the difference having just upgraded to a 3440x1440 ultrawide display and realizing how much better it is for racing.
View: https://youtu.be/8YGjP_e3U0I
And here's a comparison of a 16:9 1080p display versus a 21:9 1440p one.
Click for full size
Click for full size
And here's a comparison of a 16:9 1080p display versus a 21:9 1440p one.
Click for full size
Click for full size