obviousely , you don't want the rod to rub against the casing....Just own more engines and you won't tripp out so hard.
It use to bug the heck out of me too.
Not 50% of my enignes has bad bearings out of the box...lol

I've had never thrown a rod on any of my aircraft models yet, half of them has wear marks from the rod rubbing
against the casing.

Hello ?....did some one see or felt aluminum grits in there unburnt fuel ?.

Well in a automobile or a lawn mower...it would totally sucked if the oil slashing thingies hits the oil pan.lmao