Player Transportation, Fast-Travel and Travel Contracts

I think it's fine to have a once-a-day family summon that pulls your friends in to do a dungeon together, and then they can all go their separate ways as a compromise, but it's sort of a gateway to more fast travel mechanics. Adding any at all is dangerous and risks shrinking the size of the world in a serious way, and decreases the immersion feeling and the risk/reward of interactions. The risk of the dangerous trip to a dungeon or a specific location for a quest is zero if you can just zoom instantly across the map, after all.

Please don't kill the feeling of adventure in the world for convenience. I've seen it happen in other games and they lose so much as a result.