I feel like we miss a lot with the beginning with Anakin and Kenobi. I would have loved to see his training and mission's they went on. Then the war I would have like to see Anakin and ahsoka together. after he became Vader I would have focus on vader and Kenobi stories. i also feel like there could have been more with rogue one and Han Solo stories. Of course the two death star's I would have just made one. That would have made better since why there was a huge crater on it with the 6th movie. Most of 4 through 6 would have been the same. Now with 7 through 9 would have been the aftermath of Vader and the emperor's death. I would have like to see the new Republic taking control and the end of the empire. We could see Luke training Leia and rebuilding the Jedi

Legends does have some great material.

Timothy Zahn's Thrawn Trilogy would have made some absolutely badass movies. (I know they are using Thrawn now but... it's not the same.) Those should have been episodes 7-9.

I would rewrite Alec Guinness's dialogue in the first movie (Episode 4) so that it is actually consistent with what happens in
Episodes 1 - 3!

Blasphemy

Easy. Keep the Force as a mystical energy field that surrounds us, binds us together, etc. and expunge all mentions of Midichlorians!!