If it's in your line of sight, move it. But you can't re-move it.

The seats are low and the dash is high. That combination conspires to place the rear view mirror badly in the line of site for a right hand sweeper.  A 90 degree roll to the right and a little yaw to the left puts the mirror nearly edge on to the line of site, shrinking its field of obstruction. Every little bit helps when your attitude is zeroing in on the next cone. You are allowed to make any adjustment to the car that is within the original factory range of adjustability, and this part is certainly adjustable.