I can see how that would improve if one was having misfires. It would definitely concentrate the blow in the rim area of the nipple.
I would expect that would thin the rim down too much for me though. I actually have trouble with the nipples mushrooming after a couple thousand shots, so much that I have to chuck the nipple in the drill and spin it against a file to get the cone shape back to normal, or a cap won't fit over it.
(and mine do not misfire, or haven't yet. They only misfire in the case of having a cap jam, where a spent cap blows off an adjacent nipple and gets in the hammer channel, or sticks to the hammer face and softens the blow on the next one.)