It doesn't seem like the current system was a problem, as it had been working fine fore everyday users (maybe it was a problem for companies or celebrities but under the new system I still don't know whether Mr. Beast is Mr.Beast, MrBeast, or any number of other things without verifying elsewhere. Also, seemingly nothing would have stopped me from making my username google.com even though I'm not Sundar Pichai). Maybe they would need to add another digit to names but that's hardly the end of the world. I never need to type that number.
Usernames are so incredibly unimportant to the day to day usage of Discord. I would have to go out of my way to find out whether people I talk to daily have new usernames now. The display name is the only thing that really matters and those still don't need to be unique.
So much of the web requires everyone to have a globally unique name and it's one of the most untrue things you could believe about how names work
