It's a good point bringing up the MCU, considering that both the MCU and the SWU are both under the Disney umbrella so both are going to be nudged into a "house style". Also, I think Forbes did an article about how Ep 9's issue won't be screeching fanboys, but competition. Star Wars usually didn't have to worry about sharing opening weekend with any other AAA blockbusters, but that's changed in recent years. All you have to do is look at what's opening in December 2019 to see what it'll be up against.
Solo was... a heist movie that just happened to be in the SWU, and I think it worked because it's a flavor of Marvel's "common movie genre, only with superheroes! :D" house style.