Well, the player can look to see the setting before playing, I think instant info lets you know per game/per ball.
Casual players don't usually nudge, so I don't think that really comes into play, they especially don't nudge every ball.
Another aspect is I think they usually give 3 warnings/game, as opposed to the usual 2/ball, this means on a really good ball, you might use the extra warning strategically, although that's probly far fetched thinking.
Ultimately, I looked at it as better than wedgehead tilt=game over man!
But it is strange they decided to use it as default, but maybe Keefer really liked the idea, and thought if it wasn't default, nobody would ever see it.