A museum of clothes contains authentic garments from a hundred years ago, and it'd be quite wrong to change the buttons to zips and so forth. But when it comes to the clothes we actually wear, we feel free to adjust things to suit us - unless maybe we're involved in some kind of historical re-enactment.
The same principle applies with song, it seems to me. There might be times when we have good reason to sing the historical words, and hostorical records should never be tampered with. But singing a song in a normal setting where it is just a song is different, and I think in those settings we should be free to sing versions that fit the way we are, and that use the language we use.
The DT isn't primarily a museum, it's a song collection for singing.