Well to be fair, he did need help.
Also, worlds do have a UID. This is why, in a Minecraft server with Multiverse, importing a copy of a world won't work unless you delete the UID in the copy, resulting in it creating a new one when you import it.
Unless the suggestion is asking for an improvement for UIDs.
I think this suggestion should probably be locked.
No, vanilla Minecraft servers do not have a UID. The uid.dat file isn't a vanilla thing, it's a Multiverse thing. Please don't toss misinformation on this topic and muddy the waters.
And a Multiverse-enabled server doesn't tell the client a world UID. The whole point of this topic is *telling the client* a UID.
If you don't want to read a topic carefully enough to understand, fine. Don't call for it to be locked, just move along.