I'll be honest, the reason why I want to go alone on Skyrim and Fallout is actually a very egocentric motive 😆 Its because I want to be the hero and deliver the final blow and I dont want to share the glory.
Back in the days a friend of mine and me where playing Dungeons and Dragons on the Arcades, I was a mage and he a warrior, I remember that day because we actually finished the whole game , we spent a lot of coins and most of them where because of my friend, he kept dying and dying and I was always the one with the highest score , and then came the final boss a huge dragon, it was basically a one sided fight between me and the boss and my friend just tried to avoid the attacks, but at the last second he jumped and delivered the final with his sword and obviously the end game "cutscene" showed him as the hero...yep