Imho they should add this option but with some limitations:

1: it should be doable ingots only.

2: it should be possible among servers of around the same age only for moving to another region (to be clearer, if i am in server 298 i can move to server 299 or 297, not to server 295 or 302)

3: among the same region you can only go in older servers than yours with the option to eventually go back to your original server.

4: the number of portings should be limited to 3 per year.

One problem with this is groups. What would happen if you moved to a different server whilst in a group? Would you be taken out of said group?

Another thing is the balance of the game, a lot of things could get...a bit crazy if people were to do this. Plunder and such could become harder or easier, it'd be much less predictable, and it could just be a lot more painful. People work towards goals, build up stuff, get titles, that could become very hard to maintain.

Another problem is that "players" are server based, "players" or "accounts", whatever you wish to call them. If you were to move to a server where you have a pre-existing character, what would become of them? And player names too, because no two players on the same server can share a name, people may be forced to change names, this really could get...messy,