It's not a coincidence that all the main characters featured in this video are women. The main thing the filmmakers are trying to show is that these are girl-bosses who can do anything men can do (and more) and it's so important to show that with utter, relentless completeness, that they've created characters that are magical, who don't need to overcome anything, characters who matter mostly as individuals, who have no duties or responsibilities to anyone else (most certainly not to any men). They're just total kick-ass take-no-prisoners empowered women.
That's why these characters are good at everything from the start. It's why they never struggle. The overriding point that's trying to be conveyed in every scene is that these women kick ass. That's why the modern Mulan can't be shown as weak and later overcoming her physical weaknesses in other ways. No, she cannot be weak -- full stop. If she encounters a much larger man, then she has to kick his ass.
Addendum that shouldn't be required, but of course it is: I want to make it totally clear here that of course women leads can be interesting and dynamic and multi-dimensional. If you think I'm saying otherwise, then please don't even bother engaging, because you will have totally missed my point, which is that this particular approach to featuring women is ham-fisted and risible and probably counterproductive, in the end.