At this point at the near end of the expansion, I believe the portals to each of the Shadowland Zones/Covenants should function like the portal to Zereth Mortis.
So rather than using the flightmaster to get on a mount which flies through the non-functional portal to get us to our destination, instead allow players to just simply enter the portal…
That or change the way the flightmaster’s mount functions and just as soon as it touches the portal, rather than fly through it and fly as normal through the in-between, it instead teleports directly to the zone’s portal, skipping the transitional travel time.
Lorewise, the covenants have plenty of Anima again; the flow of Anima has been restored, Oribos has it’s Arbiter once again, things are back in order, etc… So it makes sense that they would now have enough resources and anima for the other portals to function like the Zereth Mortis portal.