dalaran is in northrend, the kirin tor ports the city to karazhan, there we get to do stuff and at the end we witness the council of six teleporting the city to the broken isles.
and ta dah!
we are there and getting our artifact quests!
- - - Updated - - -
they made a special cinematic for the teleportation spell....
and all happens after 2 campaigns and a couple of quests.
Formerly known as Arafal
a hearthstone is even more pathetic than a portal.
Does it have a cooldown? I hope not?!
If you have a powerful group of Mages on your side, who are contributing so much to the cause that they are moving their entire city to a danger zone to act as your staging point, why would you use any method other than portals to get there?
They're already risking their lives and their homes, why would they not also just give you a teleport there?
Plus once you can fly I'm sure you'll be able to get up there whenever you want. You could also use a flight point.
It's in the sky.
It looks to me like you're just looking for a reason to hate on WoW.
You wont be leaving the Broken Isles a lot so there isn't any reason for a sophisticated system to travel there. And the extra hearthstone is useful because that will give me 2 HS to dalaran(since it has more ports than Shrine so I'll set it there)
you can even buy the new kirin tor ring or bind your first normal hearthstone to the new dalaran.
Formerly known as Arafal
It wouldn't even make sense to go there by ship since there is a lot of stuff that can happen on your way there, and there isn't any established Ally/Horde hub on the island where you could land/dock. Ships wouldn't work with a flying city either