For engine gurus: Why overfilling oil is bad for engine?

[ainarssems]

1. If there is too much oil it splash around too much and piston rings do not clear all of it from cylinder walls completely so it ends up in cylinder and from there in exhaust.

2. Second is through engine ventilation system it gets in intake manifold and then pass through engine to exhaust.

It's also no good because overfilling with oil reduces air volume in crankcase. This causes greater variations between peaks and dips in crankcase pressure as its pulsating from pistons going up and down and can lead to blown seals.