To speak to this, one of the main reasons it was an issue for the wq group finder addon was that most times you wouldn't be immediately done in a zone after finishing that WQ, and occasionally it would just dump you on other servers and leave you there even after you left group. Far more than once it would just put me in South American servers (thanks Ragnaros) and my ping would remain 150+ until I either joined another group, or logged for a few minutes.
Dalaran really doesn't matter if you suffer from slightly higher ping, plus the chances of you flying to a different zone or teleporting out that resets your phase will likely set you back to normal immediately anyways.
I'm just pointing it out, not disagreeing with anything. The servers are completely trash right now. I've been doing large scale wpvp when bored and we routinely halt entire zones because this MMO is incapable of having.. massive amounts of multiplayers online. 40v40 raids in any zone will lag everyone in it until enough people die. It's also kind of atrocious that AV ran better 14 years ago than it does now, for the same reason.