The restrictions are to force people who are creating new characters to consider other servers. I can understand the theory, but they still should have had some method in place to allow existing players to bring their friends on the same server. Just like how three people can petition to start a free company, three people can combine and petition to bring a particular SE account ID on to a server. Or something. Or or the old World Pass used in FFXI, which was a pain in some respects because it cost 10,000 gil which took several days of play to raise. But at least there was the option.
Aye, I can understand the theory aswell, but in practice it just doesnt work. Most people do play with irl friends or other people they know, and not being able to create character on same server is basicly same as if you couldnt create character at any server at all. I'm quessing tons of people are in that situation atm and will have to wait probably hours to get to play the game :/.
I could understand these restrictions if there actually was HUGE load on servers, but at least on moogle I had queue of less than 20 players when I logged in.