Lucas was like the Indiana Jones line i’m making it up as i go. There was no original vision. He wrote each film individually and kept revising. There was no Saga of Darth Vader 1-6 all planned out. Vader wasn’t even that interesting to Lucas in the beginning. He was a henchmen for Tarkin in the original film.
There was no Skywalker family as such. Luke’s father was a ghost, his sister was hidden from the Emperor somewhere else in the galaxy. Vader was one of two of Kenobi’s students and the one who betrayed and murdered him.

In Empire he made Vader Luke’s father.
In Jedi he made Leia Luke’s sister and Nellith ceased to exist.

Even back then with the first two it was the story of Luke Skywalker and George thought Luke would end up with Leia, it wasn’t this mythic Saga with incest overtones.

He only reframed it as the SAGA of Darth Vader. It turned Star Wars main character Luke into an afterthought, that in itself is insulting. I reject it as well. The OT is Luke’s trilogy, and the prequel Anakin’s. The prequels were made later and they don’t work in a 1-6 sequence of viewing, not even in the 2020 Special Edition 4.0 Maclunkey edit.

I don’t revile the prequels as i once did, but the idea they were always meant to be what they now are is a joke. Anybody who grew up in the 70s and 80s knows Lucas is full of it. I will give him credit for being creative and keeping at it, its kind of funny though how the retcons in the OT were accepted and the prequel wasn’t. And he isn’t the only person to revise a work. Tolkien did it and the new edit became the new version of the Hobbit to bring it in line with Lord of the Rings.