From Variety’s article:

Kennedy had her own ideas about how the film should be shot. In an interview with Variety last year, she said she wanted the film to have “…a heist or Western type feel,” adding, “We’ve talked about [Frederic] Remington and those primary colors that are used in his paintings defining the look and feel of the film.”

http://variety.com/2017/film/news/star-wars-han-solo-kathleen-kennedy-director-fired-1202473919/

After reading that, I struggle to see why they thought Lord and Miller would be a good fit.