I once went to a wedding involving academic linguists and Hindu prayers. A Hindu priest chanted a prayer in Sanskrit and then an academic linguist followed up by chanting the same prayer with his view of what it would have anciently sounded like. Notwithstanding the priest's own view of his Sanskrit as an ancient language, his pronunciation didn't match up with the academic linguist's view of the historical pronunciation.
Relatedly, I went to a spoken Latin event where I (an American) spoke Latin with an Italian man. His pronunciation and mine were wildly different, although we could understand each other. Neither was all that similar to the academic linguists' view of what our conversation would have sounded like thousands of years ago, though I guess his vowels were generally closer and my consonants were generally closer.
People retaining ancient languages for liturgical and scholarly uses are generally not that great at preventing the pronunciation from shifting, and I think that's true across the board. ("Atque memento, nulli adsunt Romanorum qui locutionem tuam corrigant." -- Henry Beard.)
Relatedly, I went to a spoken Latin event where I (an American) spoke Latin with an Italian man. His pronunciation and mine were wildly different, although we could understand each other. Neither was all that similar to the academic linguists' view of what our conversation would have sounded like thousands of years ago, though I guess his vowels were generally closer and my consonants were generally closer.
People retaining ancient languages for liturgical and scholarly uses are generally not that great at preventing the pronunciation from shifting, and I think that's true across the board. ("Atque memento, nulli adsunt Romanorum qui locutionem tuam corrigant." -- Henry Beard.)