The upside is that with enough training, you can still produce almost the entire feminine vocal range. It's a lot easier to get a hyperfeminine voice with thickened vocal chords than to get a hypermasculine voice without them., especially due to how resonace works. It's not that hard to get your larynx all the way up, but when you want to expand the resonating space in your throat without having gone through a testosterone puberty, there's just clear physical limits you run into.