I don't think Soo, Worsham, or Benanti are just talented soprano ingenues—I think they each deliver much more. Moreover, I think we're discussing a very tiny list of actresses on this thread because we do realize how much the role of Eliza Doolittle requires beyond singing pretty.
(Also, for what it's worth, look at the immense range of acting required by roles such as Natasha, Eliza Hamilton, and Amélie. Just saying.)