The thing that I found interesting was during trump’s visit to the Vatican, he asked trump’s Slovenian wife if she was feeding him potica which indicated a surprising level of knowledge of the cuisine of a country which is largely insignificant on the world stage (as someone who’s half Slovene and has a loaf of potica on his kitchen counter, I think I can safely make that declaration).
Actually he was more fluent in the Piedmontese dialect. His Italian was somewhat wobbly at the time of his election.
I don’t have enough broad knowledge of Spanish (Castellano) to comment on its intelligibility across dialects (although Argentine/Uruguayan Spanish is more of a challenge to my Mexican-Spanish trained brain than European Spanish).
Part of it is the death and retirement of the last generation to be taught Latin from nursery to ordination.
But given the prominence and resources of the Vatican, they could find a few Latinists.
Definitely not surprising hearing a pope using it in a speech.
Not sure about Gen Z and younger people though.