Locked Out of The Venturer's Passage Experience

I basically got The Horizon Codex through the Supremacy Method, and this permanently locks me out from the &quotPass beyond with him&quot option for the The Venturer’s Passage storyline at Avid Horizon. Is there a reason for this? Doesn’t this diminishes the gameplay experience? It’s the same deal with the Zepplin thing, if someone got the &quotA Travelling Light&quot first before encountering The Empire of Hands, it locks them out of doing the Zepplin thing too. What’s the purpose of doing this? It couldn’t be because of the item itself, since players are able to get the Legacy Item &quotA Dream of Red&quot over and over again. Why?