It's simply crew requiring wx info for their destination so they can brief the arrival in a timely manner. As has been said by fireflybob it has more to do with the volmet system than anything else. No point bashing RYR, my airline does the same thing. I've never done a CIA without obtaining the latest wx from Zurich. I don't care if it's CAVOK the latest wx is still required for consideration and Zurich is the most effective way of obtaining it for most northern Italian destinations.