Indeed. I suppose what I'm afraid of is that a modern-era film engaging with feminism that was well-written and not-preachy might still be perceived as preachy by some because it's an emotive issue, and that a poorly written film dealing with those same issues would just be flat out preachy and terrible. But the historical period might give needed space to some who would otherwise feel it was a personal attack, in the case of something well-written, or at least provide a narrative conceit as damage control in the case of something badly written.
(And Darius - glad you liked it, thank you!)