If you want to skip all that, you literally can. That was your sisters choice to speak with every NPC. And sometimes those NPCs gave you a side quest or even hidden items, so they weren't useless. They just gave the world character. But if you wanted to just go to the objective, there wasn't anything stopping anyone really. Most games didn't hide objectives from you. Imagine worlds like the Witcher or Skyrim without the fun optional side quests and characters. You'd have Starfield.