The amberizing of music is in no small part the result of early modern developments such as the Petrarchian notion of ad fontes, the advent of the printing press and copyright. Still, hymn texts have often been modulated over the generations.
The same could be said for All Creatures of Our God and King. If eliminating (or at least significantly reducing) the use of the masculine pronoun wasn't the reason, why don't we sing "O Praise Him" anymore. There are countless such examples where the text changes are seemingly agenda driven or at least not carefully thought through despite all the claims to the contrary.
Same goes for Faith of Our Fathers/Living Faith. I've never seen an explanation for that one.
Haydn is the Apostle of Sanity
But it is not an example of changing a text. It's a whole new text.
From a strictly theological standpoint, I think the editors of W3&4 improved on the original. Which isn't surprising, since Wesley was not, in point of fact, a Catholic.
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