A picture's worth a thousand words:
Though in this case, I think some of the words are "you idiot, you left the flash on again, had multiple types of lighting on, and there was a curious, furry animal in the frame."
Anyway, looks like it's not just to help your draw by improving the overall grip, but because you have to avoid the karda and chakma! And if you do accidentally snag one or both, your index and middle fingers aren't doing much to grip the handle. The checkering and lines are usually positioned to help, too.
Hm. Gripping hard with the ring and pinkie fingers, but leaving the index and middle fingers relaxed, also allows you to add a bit of a "whip" to your swing, when hitting soft targets.
I don't recall ever reading the "avoid the karda and chakma" theory, though it could be my memory going. I've been averaging about 8 hours of sleep per week lately, so remembering is hard sometimes. But anyway, it's what makes the most sense to me. And I'm guessing most people toss their karda and chakma in a drawer, so grip might never be an issue. Now I want to make a joke about Karda living in a drawer, but I don't think I can pull it off.

Though in this case, I think some of the words are "you idiot, you left the flash on again, had multiple types of lighting on, and there was a curious, furry animal in the frame."
Anyway, looks like it's not just to help your draw by improving the overall grip, but because you have to avoid the karda and chakma! And if you do accidentally snag one or both, your index and middle fingers aren't doing much to grip the handle. The checkering and lines are usually positioned to help, too.
Hm. Gripping hard with the ring and pinkie fingers, but leaving the index and middle fingers relaxed, also allows you to add a bit of a "whip" to your swing, when hitting soft targets.
I don't recall ever reading the "avoid the karda and chakma" theory, though it could be my memory going. I've been averaging about 8 hours of sleep per week lately, so remembering is hard sometimes. But anyway, it's what makes the most sense to me. And I'm guessing most people toss their karda and chakma in a drawer, so grip might never be an issue. Now I want to make a joke about Karda living in a drawer, but I don't think I can pull it off.