SR is a solid D ticket, and really could be classified as an E ticket at this point. There is no true secondary ride in Galaxy's Edge. Further, you need far more than one secondary attraction to adequately distribute Crowds.
Yes, they added one of these in New Fantasyland. Still nowhere near enough. However, the MK already has many of these secondary attractions, so throwing an E ticket into the mix is not as big of an issue as it is at the other three parks. Fantasyland alone already had IASW, Philharmagic, the Carousel, Pooh, the Barnstormer, Dumbo and the Tea Party. (Based on demand, we'll call Pan at least a D ticket). Plus they doubled Dumbo's capacity. So while they didn't really do enough to adequately disperse the crowds drawn by Mine Train, they did more than in other parks and they are dealing with a park that was designed with these concepts in mind. So the impact is tangible, but not overwhelming, again, unlike at the other parks. Now Tron is coming with no additional supplemental attraction, so the situation will further deteriorate.