Atsym Sknyfs
Superstar
I don't think they made a conscious decision to prioritize making more money over spending a little more to get the writing good. There are brilliant writers in this world that would write those movies for free. And terrible writing can kill the golden goose (Game of Thrones would be minting HBO cash to this day if not for season 8).
What probably happened? They just fukked up. They hired two superstar directors who were completely unaccountable to each other. Nobody had the ability to coral this because they probably didn't want to hurt the superstar director's feelings and the train was moving too fast (SFX teams in place, locations scouted, actors scheduled, etc.). Before they started, their boss (Kathleen Kennedy?) should've got them into a room and been like "So what's the plan?".
JJ Abrams prob thought it would be alright cause he had the first movie so the ability to set the story in motion. He underestimated how willing Rian Johnson was to blow up the whole trilogy for the sake of his one movie. So once the ink on the script for The Last Jedi was dry, The Rise of Skywalker was doomed. There was no where for the story to go.
LUCAS gave his good dear friend KK treatments for 6-9 and other stuff... She threw them in the garbage. She threw the EU in the legends..
The problem wasnt really the directors. KK didnt have a trilogy mapped out they made 3 movies