Wouldn't the cross-hatching on the whole chip (inlay included) help with security -- in that a switched inlay that doesn't match the cross-hatching on the body of the chip would be noticeable.

Also, in a chip catalog, I recall that the cross-hatching was described as helpful in stacks of chips staying put on craps tables, etc., where the dice may hit them in play. The cross-hatching forms a micro-vacuum between 2 chips when stacked (vs. smooth surface chips).

You're the expert on chip manufacturing, but that's what I've heard over the years.