Is it really just "some movies have coherent stories, and some don't ¯\_(ツ)_/¯".
I think if you listen to Kathleen Kennedy talk about her vision for Star Wars, it becomes pretty clear that her goal was not "make good cinema", it was "push (racial and gender) diversity-for-the-sake-of-diversity agenda".
I mean, her contribution to The Mandalorian (which luckily was entirely conceived outside of her influence) was:
> In March 2018. Kennedy added that the series was an opportunity for a diverse group of writers and directors to be hired to create Star Wars stories, after the franchise's films had been criticized for being written and directed by only white men.