Timing chain lubrication

I don't know how one can rely on the tiny holes not plugging up. I don't quite follow the design theory. With the thrust plate on, won't oil just dribble down the side to the bottom of the pan without even touching the timing chain? I think more important is to get the latter "drip plate" that installs over the thrust plate, with a finger in the upper left "missing bolt" hole to dribble oil down onto the timing chain. I got one for ~$10 at a dealer.