Congested is NOT useful, if you already have chars on your main server. Am I allowed to join my guild with a char from another server? No I am not. I see, why it is useful to prevent server transfers to congested servers, but making new chars, where you already belong is a kick in the face.

But there are way to few servers anyway. In Europe from currently 36 server only 4 are accessable at any given time. I check the serverstatus many times a day and never you are allowed to use 32 out of 36 servers. This system is simply pissing off new players. I am checking this often to get parts of my family to my server, which currently is not possible. If we could move a whole guild with all alts to a less populated server for free, well... but we can't. Currently congested worlds stops friends/families from long term fun. Always jumping worlds is not fun. I even told a friend not to start FFXIV, because of this. We talked about it, he plays something else now.

"Hey, wanna play FFXIV with me?"
"Cool, what server are you on?"
"[name any, it does not matter currently], which you can't join. But you can join me there with world jumps. Play on any free one"
"hm... can I join your guild there?"
"No"
"Well... perhaps another day then"