You are bringing up a religious discussion.

If you live near the coast where salt and/or humidity levels may be high, prime.

If you lose sleep or worry about corrosion, prime.

If you lose sleep or worry about weight, don't prime.

The is no right answer. What makes you happy is all that matters.

I did prime my RV-10. I had corrosion issues in my Cherokee and didn't want to go through that again in the RV.