I think it has everything to do with who is making this show vs. who is making the movie. Dave Filoni is working on this show and it is not his first star wars tv show, he also directed Star Wars: The Clone Wars animated series and Star Wars Rebels. He is working alongside Jon Favreau who directed the first two Iron Man movies, Jungle Book and the Lion King, so he knows how to create a world.
The head of Star Wars movie is Kathleen Kennedy, a woman who basically hates Star Wars and who hired incompetent and visionless directors who did nothing for the franchise. The best thing that came out under her hands was Rogue One.
I think that is the main difference.