Man, I read this blurb about the animation on Maul:
“The series features stylized animation emblematic of the gritty new cityscape locale of Janix combined with old-school filmmaking methods to capture painterly brushstrokes on glass and other physical elements.
Cinematography Lighting & VFX Director Joel Aron really took it up a notch with going back to the practical ways of capturing brush strokes by painting them on glass, shooting them then strategically placing them in shots,” says Executive Producer and Vice President of Lucasfilm Animation Athena Portillo. "He even went back to establishing matte paintings on canvas. There's always different challenges with every show that we do, but this one in particular raised the bar. We also wanted the animation body mechanics and the facial to be more fluid from our previous work and animation director Keith Kellogg worked closely with CGCG and our internal animation team to upgrade the performances of our main characters."
Wow! They are doing some great animation work on this, blending the CG with other elements. Those backgrounds look so amazing, and that's why! The full article is here:
https://www.starwars.com/news/star-wars-maul-shadow-lord-first-trailer-poster-art