Now, with newer instruments having 10", 12", 14", or even flatter fingerboard radii, especially with five string and other multi string basses, string distance from the pickup is more uniform, so the differences in string height string to string don't matter as much anymore, to say nothing of items such as adjustable pole pieces, arc'ed blades in pickups, and other developments to help tone. On these flatter radii fret boards with advances in string and pickup technology, feel is more important than before, hence the development of balanced tension string sets.