And yet whenever any one of your "friends" sees or references your identity, it's displayed and interacted with as simply "John McDowall" or, more likely, "John

And yet whenever any one of your "friends" sees or references your identity, it's displayed and interacted with as simply "John McDowall" or, more likely, "John". Is that situation, in which merely a URL doesn't precisely map to your stated identity, somehow broken in a way that an "FM-2030" mass-name-changing cultural solution would fix? Particularly when we consider that, to date, username preferences are for decidedly not unique options. They tend toward things like, HaloFan1 and JohnSmith73 and MrMcDowall. Further, in almost all modern cases, these are just getting translated back to non-unique names and nicknames for display.