Title says it. Makes no sense to me - just annoying.
Thank you for your answers!
It’s that way to prevent players from entering the base of their opposite faction in multiplayer.
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A little off-topic but is a good illustration of why this is the smart way to go and makes perfect sense: a buddy of mine and I run a lot of multiplayer together - he’s fairly new and I like to help him out. In one run thru we decide to see what happened if we each picked a different faction. Totally screwed up our quests for that. So when we got to Elite difficulty we decided to join the same faction, so we did. But for some reason since I was hosting the game when we went to our ‘shared’ faction now, when we entered the vault, everybody start attacking his Guardians (he was running Oathkeeper.) It finally fixed itself when we got to Ultimate but it was hilarious.