Putting all symbolism aside :
As a thrusting weapon I'd imagine that a keris luk (wavy) would do more damage to your innards than a straight blade ; might make a larger entrance wound too ; but the point (no pun intended Jose
) may be moot as it only takes 2.5 inches of penetration to effect a fatal wound to the torso .
The perception that the kris of the Moros in its waved form is more demanding for effective use seems prevalent ; but that does not tell us whether if used properly the wound was more devastating or not . A wavy kris has a longer edge than a straight one and is used differently than the Keris of Jawa .
With the huge European Zwiehanders the waves might make parrying a pike thrust a little easier .