I just watched Allegra's knockout, and I didn't think that there were too many runs, and I think that (although enunciation is usually something that is below par), less enunciation is part of the song itself - consider how Sia sings this song.
I'm kinda confused why people are saying there were too many runs, cause they sounded natural to me and I didn't even think about the runs during the performance, while in Joanna's AFM, I was cringing at the over-the-top and way too many runs (despite her being one of my favorites). In Allegra's case, I didn't think the runs took away from her performance, while in Joanna's I felt like they diluted her unique tone and took away from the performance.