This is Disney we’re talking about. They didn’t hesitate to fire the original directors of the upcoming Solo movie because the directors encouraged improvisation and went off script, diverging from Disney’s vision. Everything about TLJ was scrutinised and given the tick of approval; Rian was not some wildcard who caught the head honchos at Disney off guard. Mark Hamill made it very clear (on record) that he didn’t like Luke’s portrayal in TLJ, but had to follow Rian’s vision. Disney have given Rian another trilogy to make, thats how confident they were in him.