I just thought it would be really cool if things like grass and trees grew in the world. Maybe changing seasons with snow sometimes (and rain.. like bungo give us some rain plz). Exploring Destiny's worlds for the first time was really really awesome. I get some real heavy nostalgia just from thinking about it (especially Venus, that place is dope). If we could find new things or places that have changed, perhaps over time rock has eroded and revealed a new path or something along those lines. Certain areas only being accessible during certain times like when it's raining a river could block our access to something. Basically, keep the worlds fresh, keep them changing. Even if they're on a cycle and go back to how they were originally at some point, it would make the game feel all the more refreshing every time you go back to it.