I do find it slightly odd that on the last programme there was a soprano singing in English but they decided it needed subtitles, also in English. To me, something is going wrong when the music dominates the lyrics to such an extent that a native speaker can no longer understand what is being sung.

Of course, there are occasions, like Songs of Praise, where you get English subtitles on English singing for other reasons.

I do go to operas occasionally, and surtitles are common, especially when the opera is in, say, Italian, but it is not unknown to have English surtitles over English singers then, either. But it still makes me feel the music has gone astray in some sense.