To my mind, its insulting to the people then. We know women and some minorities weren't allowed to progress, so when you make say, a Poor Things, where the lead is just like 'I'll go to medical school in Victorian London', and everyone is just like 'Awesome, no woman ever thought of that before, we've no issue, though!' It suggests that the reason there was little progression then wasn't that were was measurable oppression, its just no one wanted it enough.
Same as a lot of the US films about civil rights like Hidden Figures or The Help, where the mean white ladies in the 60s are the power and enforcers behind racism while most of the white dudes (who were predominantly still in charge of law, education, etc.) look on baffled like 'What are you gals cat fighting about?'
Generally, films and books have gotten so lazy on this, lots of therapy speak that didn't exist 30 years ago, modern approaches in period set books. (I read Joe Hill, Stephen King's son's novel, King's Sorrow, bloody awful BTW, parts were set in the 90s but it was all 'I'm your emotional support system!' and 'Trans women are women!')