I would most likely never do it. Possibly for the experience. Though I always thought it would be interesting to be able to system link and play on another’s game. Everything could easily be in the same in a game. You could play normally like one player except you would have a buddy doing the same thing along side, levelling, quests ext. Just when entering a building I would imagine both would automatically teleport to each other
I thought this would be the best alternative instead of multiplayer. It just depends if your a person who does this sort of thing. I'm not familier with how System Link works its rather just an idea.
I imagine this should go in "Fallout 4 Ideas Thread"