User accounts are fragmented and just because you signed on at lemmy.world doesn’t mean your account exists on lemmy.ca.
https://github.com/LemmyNet/lemmy/issues/1985
Communities are fragmented and /c/games on lemmy.world is completely different than the one on lemmy.ml with its own users, set of posts, etc.
Lemmy does not currently allow for instance or user migration.
https://github.com/LemmyNet/lemmy/issues/3057
Nor does it allow for shared communities (ie the aforementioned /c/games is unified across multiple instances)
https://github.com/LemmyNet/lemmy/issues/3100
We are in the early days. If you’re eager feel free to join in the development on these any many other core issues. There’s real potential here.
I don’t think the post has a ton of merits for reasons that have already been described. That being said, there is one potential issue that I’m surprised that hasn’t been mentioned, which is impersonation.
Say someone takes the username jimbo on an instance somewhere and becomes super popular. Then someone else decides to create the same username jimbo on a similarly named instance and tries impersonating the other user. Sure, people can look and see “oh this isn’t that other jimbo” but you would have to look and see.
Probably not a major issue, but could theoretically become one.
As far as I’m aware, there’s no way to nickname/tag users. That would solve the issue. You could tag someone as the real one and the tag would only apply to that address specifically, not the username in general. It seems like a relatively easy solution, and any others are very hard with the realities of federation. We can’t have a central authority to check names or anything like that.