Grip, and a **** ton of it!!
Quicker steering, less input required
There is a few guys which use them for grip work with very good results.
Offset rack spacers are to illuminate over centre. An issue faced when having big lock..
You wouldn't need to run them, but tie rods would be potentially too short, so require extending... Would be less ball ache just using the spacers.
Build a lock stop up... I have none... But done a lot of work and fettlering so nothing hits/locks up on lock without needing massive gay silly track and arches etc