Talking of Spielberg and Lucas:
A screenshot of Steven Spielberg talking about how George Lucas persuaded him to direct the Indiana Jones films, with George being very economical with the facts of how many stories he’d actually wrote. . . . even to his good friend Spielberg!:
^ from the Lucasfilm ToD wiki page: https://lucasfilm.fandom.com/wiki/Indiana_Jones_and_the_Temple_of_Doom#Development
Spielberg is also shown talking about the subject 13 seconds into this YouTube video:
The Making of The Temple of Doom | Indiana Jones Behind the Scenes