Auto group forming is the big one. Teleporting to dungeons just comes with it. Xrealm players only helps the auto forming.
The auto forming allows people to queue as any role, class or spec without being selected based on those things. Basically- freedom to play what you like instead of what is needed to help the party leader get their targeted gear.
You can even take the time in queue to gather or fish while waiting for it to pop. The handy estimated timer allows you to better use this time while you wait.
Im done leveling alts, but from what I hear, it’s abysmal. Access to xrealm players would be a huge plus for them when running low level dungeons.