This will also minorly help lube hold better. Not much, but some. Not that it needs it externally.
It is ironic you mentioned that. Today while rexamining this, I noticed that the textured finish is much more noticeable when wiped down with an oily rag.
So it appears you are most correct about this. I wiped it off with a dry rag and it’s much less notable. It is holding the oil very well. I did not know this but it does compute and make sense.