It's also a quite different strategic situation. The US after 9/11 could be confident to win any military campaign easily (well, winning long-term is a different thing…). Here, what's the plan? Sure you can probably take the force of 300 out easily, but don't they realize they are outnumbered in 1:100 odds at least?…

What do you mean by benefitting? Have you seen what this woman can do? https://www.youtube.com/wat…
The fact that she can do all of the fighting herself is a huge benefit to the director. There is no need for awkward cuts or framing the scene to avoid showing her face