I would say they lacked both a vision and a plan. Sure, they had a 3rd script before the second one was released, but it was clear that the first two filmmakers had different ideas for where the story should go.
The 3rd script intended to connect what threads were left, but Colin originally wanted Luke alive for the finale, and its doubtful JJ wanted Snoke dead and Rey's Parent's to be nobody's at the end of the day.
Then once Colin was gone, JJ , in addition to making her "somebody", introduced Palpatine and several others ideas that weren't present in the first two films.
Lucasfilm and Disney had a plan for a trilogy and spinoffs, but they didn't seem to have a plan for keeping all the filmmakers and writers on the same page, nor a plan to connect the stories in such a way they wouldn't contradict each other .
The storyteIling elements of the trilogy is what fans tend to point when they refer to a lack of a plan.