I thought the Bechdel test was set up to demonstrate blatent gender bias across the movie industry as a whole, by putting in conditions that seeem like most things should satisfy, but come as a shock when they dont. i.e. its supposed to demonstrate that gender bias exists.
I dont think its a very accurate way to measure character depth.
The thing is the "So easy to satisfy" is a bit of a myth in my opinion.
As it requires you to have a scene with two characters speaking to each other about something that is usually not plot related, or it requires you to isolate two characters. Just by having the plot revolve around a male character you can make it impossible to pass the Bechdel Test and the Neutral Bechdel Test (as I have unfortunately have seen). Some cannot succeed just by having not enough characters and no conversations to speak of. Some will never succeed because they never isolate their characters.
If you want to be as specific as possible...
The Bechdel test was created as a joke as a sort of "Take that" against movies in a sort of comical style. It was later adopted into its current form.
Though that is a bit like saying the true source of April Fools day. It doesn't really apply anymore.
Suffice it to say it isn't really about "ease of success" as that is mostly an illusion so much as how frequent women are used, how much character they are allowed, and what is the depth of their concerns.
I dont think its a very accurate way to measure character depth
It isn't an accurate way to demonstrate blatent gender bias either. A lot of movies that show strong and deep female characters outright fail this test. As well how to apply the test is not clear as well, it is easy to pass things by being very specific or fail them by being abstract. I've seen people say "Sex in the City" fails, and yet that is only because all their conversations are just preludes into talking about men.
But to explain this one is easy. In a movie what is a woman's concern? Is it about something other then a man? congratulations!
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I may want to amend the Neutral Bechdel Test to also exclude "talking about the main plot"
Now That certainly runs down the list.