CopleyScott17 said: "If the previous versions weren't Grammy-worthy, I'm not sure why this one would be."
Previous versions have been Grammy-worthy and were nominated in other categories. However, this category has been expanded in recent years to include concept albums, play scores like Harry Potter, and other musical theatre-adjacent albums. The live album was probably the only other album eligible in this category. And let’s be real, musical theatre voters were probably not aware of the show until it reached Broadway.
In terms of why voters would want to award this particular version of the score, it’s a way for Anaïs Mitchell to have a Grammy, it’s a way for Emmy- and Tony-winning legend André De Shields to add a Grammy to his mantle, because they actually like the recording... many reasons. I think its only competition is Moulin Rouge!