It’s largely due to the outdated P2P system. This is largely outclassed by modern servers. Basically, every instance is located off of one person’s console and the rest of the consoles are networked together to share the load of the other non-specific interactions. Basically, every console in an instance shares a portion of the non-character interactions like audio, skybox, particle effects, ect. Beyond this, every link you’re connected to that has bad internet causes some sort of lag for everyone in the lobby, be it small things like stuttering particle effects or kicking the entire group to orbit due to a disconnect. This is largely due to the ratio of players with bad internet or systems in a session to the total number of players there. Bad connection issues could be not due to your internet but the internet of the people in your sessions especially for something like disconnects. Bungie does a lot of this geographically (though with some hilarious exceptions) so blame the people in your area for poor connectivity. It could also just be you as a large portion of matchmaking is connectivity based (especially the tower). A dedicated server would solve a number of issues P2P causes and would alleviate a lot of stress this game puts on older consoles. It very well could be you or it could just be the people you’re stuck with in lobbies due to your less populous location. Just my basic understanding. I’m sure there are people better versed in this than me, but these are my two cents. Hope this helps somewhat