Yes, there is. Operatic singing gives different stresses to the words and prolongs vowels. Operatic singing in one's own language is not necessarily easier to understand than in a foreign language.
I remember reading criticism of - exactly - a Hansel and Gretel sung in English with the hope that it would be easier for American children, and the commentary was - "well, to avoid the problem of English subtitles so that the children understand the German text, they're singing it in English so that now we need English subtitles so that the children understand the English text."
Since musicals don't employ operatic singing (that's one of the main differences between musicals and operas) the lyrics are much easier to understand.
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