Should I plug the rocker panels holes?

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I've heard two "opinions" on pluggin up the access hole in a rocker panel. I'm
not talking about the drain holes along the bottom. I'm talking about the large
hole in the front of the rocker.

One opinion is that you want to plug up the hole to keep out water and dirt.
The other is you want to leave this open so that air will come down the cowl
and dry out the rocker panels.

The truck I bought to restore had the holes plugged and the rockers were
completely rusted though. But that doesn't mean that was the cause of the rust.

What's your opinion?