Finn had more point in Force Awakens than Last Jedi - the only thing his entire storyline added to the story itself was making the First Order aware the escape pods were released, and that could have been done by the FO having upgraded their scanners, or looking out a window.
I wonder if Snoke really is dead. Just killing him off, and saying "your parents are just junkies lol" to Rey kind of flies in the face of nearly two years of fan speculation!