Lethality on Supports?

As a support main, I have a few questions regarding lethality. Before the removal of armor pen, I would use hpen runes on supports like sona, janna, and karma. I'm aware that lethality is stronger late than early, so this will diminish the power of early game auto attacks, right? Should I be swapping out my hybrid pen runes for magic pen to maximize my early & late game whilst increasing my lane dominance? It seems like this would be the way to go, considering the fact that I won't necessarily be poking with autos very often in the late game as a support. Is there any scenario in which lethality would be better on supports than magic pen? Just doesn't seem like it.