As @chonglibloodsport@lemmy.world says, the community draws the line, and that's the point of having a variety of categories. Plus, Speedrunning is not a hard-and-fast ruleset... only if you want to participate in the community leaderboards do you actually need to abide by the "rules," otherwise speedrunning is whatever you want it to be. If you want to sit there and mash through the cutscenes each time, go ahead and you've just made your own category and can set the world record in it. ;)