I think everything goes in cycles. Radio jingles were very American sounding in the 50s and 60s. Quite Australian sounding on the 80s and 90s - think Rock of the 80s, Position 13 2WL , From out of the West 2WS, Keeping Melbourne Rocking 3XY and Rocking in the Summertime MMM.
Now someone in radio land thinks we like the sound of an American accent when we tune into a Sydney station. Personally I think it’s out of place. Just like Starbucks in Australia.