Crosshair is no longer in the middle of the player's screen. Why?

With all the new gameplay that has been released today I have noticed that the crosshair has been moved to slightly below the center of the screen. I went back to earlier gameplay videos that have been released to check if it has always been that way. It hasn’t, which means that this is a fairly recent decision made by Gearbox.
I’m curious as to why this decision was made.