I'm not sure if it's due to the popularity TV where there are A, B, C and D plot-lines, but modern films tend to have way too much going on. This is how we end up with Superhero films that run nearly three hours. It's also how we get a cascade of different endings that have to be resolved after the big bad guy has been dispatched. Though Queen of Katwe is far from a straightforward story that is over and done with in 90 minutes, it does take the novel approach of resolving all of its lesser plot-lines before concluding the main one. This way, when the movie is over, it is over. I desperately hope that screenwriting courses will start teaching this as a way to more delicately handle all of that cinematic bloat.