Why do you use humbucker supports?

Hi, I've been wondering about this for some time now, looking at Angus images and I've noticed that in recent years all of his SGs with bat wing have a humbucker support on the bridge pickup, but I don't know if it has a utility or if it's just aesthetics, does anyone know?

Hi, I've been wondering about this for some time now, looking at Angus images and I've noticed that in recent years all of his SGs with bat wing have a humbucker support on the bridge pickup, but I don't know if it has a utility or if it's just aesthetics, does anyone know?