I'll absolutely echo the sentiments that what KMT has had to endure is unacceptable and horrible, and fuck the racist/sexist ass hats that abuse(d) her.
Character wise in-universe, I thought Rose was fine but that the entire Canto Bight sideplot was a massive waste of time. It's not her fault, as a character. It's the writing, it was a huge dip in the movie, and fast forwarding through it on Re-watches improves the film substantially.
I would have loved to see Rose and Finn in a more interesting and meaningful story in TLJ than what we got, and because of what we did get I don't really care that Rose wasn't around all that much for ROS. She could have 100% had all of the lines that Dominic had, definitely agreed there. But she was a side character that didn't need to tag along with the main squad on the main mission, as well. Demanding that she should have is a bit odd, to me.