I feel like my inexperience with MMOS in general makes me unqualified to comment much on this but I don't think this has ever been a concern for me. Going places too fast would be a concern though, as with the poster above, I too have groaned a little at the thought of having to run all the way down to Whitebrim for example, but I am glad for the fact that not every single place ever has an aetheryte. Even on Balmung, maps can be quite empty as it is, how sad would it be if everyone could teleport directly to where they needed to be most of the time? I like the world looking a little more alive with actual travellers, especially ground-travellers. I'm not in support of flight completing wiping out regular mounts personally, so the general concept of getting places even more quickly strikes me with a feeling of uncertainty.