The largest QoL improvement that I can think of right now would be to give us either the option to select which map instance we zone into when teleporting via aetheryte or allow us to switch between instances wherever we are, not just by leaving and re-entering at the zone doors. As someone who does most of their questing with a partner, it has been a huge headache trying to make sure we end up in the same instance. Either we have to walk everywhere we go or gamble when taking a teleport that we will be dropped into the same map.

If there is a way to end up together and we are doing it wrong, please let me know, because it's getting a bit silly. :/