But you're not missing key plot points. Case in point; You can encounter Shadowheart numerous times; but ignore her every time - If you do, so, she will end up in your camp.
Thing with Ethel is - You *can* speak with her, or go directly to her swamp and meet her there. I'd argue that's better than anything for a only-once- player. Lastly, if you only play it once, you don't notice it, either. BUt I doubt that's what most players do. Skyrim held on to its playerbase for ten years. The Classic BG's to this day.
