Many dancers today don't do well in interviews. If the voice is high-pitched, chirpy, or erratically paced .. if diction is sloppy ... if "perky" is the goal .... then "glamour" probably will not be the result.
I have the impression that many dancers do have voices that tend to be on the high pitched side, although it doesn’t seem to be a contemporary development. (Of course, some opera stars don’t have wonderful speaking voices, either.)
Younger dancers tend not to be the most enlightening interviews anyway, although I still enjoy reading/seeing them, because they’re still developing as people and artists. I don’t think they’re necessarily aiming at a ‘perky’ effect, it’s just that they’re, well, young and perky.