It feels really odd that they are willing to force that on PvP groups where faction is a core part of the game mode, but not dungeon groups where faction is irrelevant to the game mode. I understand the sentiment from the devs, but the reality of what game modes enforce this seems very counter to the goal.
I would love to be able to run timewalking with a single friend of the opposite faction. It always takes the wind out of my sails when there’s a call to run some dungeons in the guild or discord, then we group up (rarely with a full 5) and realize we’re on different factions so one of us can’t play the character we wanted to.