While I have great respect for Robert McKee, I do not believe the concept “beat was coined” by him.
The storytelling concept “beat” has been taught to actors long before McKee wrote about it in his informative book Story.
In fact, the storytelling concept was around long before the word “beat” was even uttered.
The term “beat” is said to come from Constantin Stanislavsky's (1863 – 1938), who was a Russian actor and theatre director. Stanislavsky was trying to explain the storytelling concept using the word bits. However, because of his thick Russian accent, everyone thought he said, “beats”.
Stanislavsky pioneered an acting style that was taken up by Elia Kazan’s Group Theater who trained actors in a realistic style of acting. That style has evolved into what is now known as the "Method”. The Method is a style of acting taught at the Acting Studio. Acting Studio members include Marlon Brando, Robert de Niro, James Dean and many more.
Btw, a “beat” is actually composed of 2 parts: Motivation & Reaction. The video seems to focus on the reaction half of the beat. But, you cannot have the character change/reversal they speak of in the video without the first half of the beat. Without a motivation, you don’t have the character reaction/realization. If the 2 parts of the beat do not walk hand in hand together, the beat will not work or it will just have a very weak impact on the viewer.
There is more to tell about this concept but I fear I’ve already bored you enough.
Evelyn Salt -- Salt
Ava -- Ex Machina
Foxy Brown (Pam Grier)
Gloria (Gena Rowlands) -- Gloria
The Bride (Uma Thurman) -- Kill Bill
La Femme Nikita
Lisbeth -- The Girl with a Dragon Tattoo
The Girl from Kick Ass
Elizabeth (Cameron Diaz) From Bad Teacher
The female Anti Hero’s in Anime
Just a quick few.
As said, not as many as men, but female Anti Hero's have a long rich history.
You said for Movie Magic Screenwriter --
"Also, there's no website for help or support."
I don't find that to be true.
Movie Magic Screenwriter has a Support & Help website that's very easy to find.
It has been around for years.