I honestly do not mind it one but. I quite like the interface. It’s minimal but there are some bugs to it which is to be expected. I really do like the overall design of it though. There isn’t too much going on. It’s like old Reddit which I am a big fan of
Instances do not care about users on other instances like that.
A user is not unique by username alone. A user is unique by username AND instance. There may exists another skye on another instance, created by someone else. But only you can be skye@lemmy.world
Think of it like email addresses.
You grab the name abc on gmail, giving you the user abc@gmail.com
Some other person can grab the same name on another mail provider (ie. instance), say abc@outlook.com
You don’t need to have an account on every email provider to be able to send mail accross providers. But nothing is stopping you from making an account on every provider, it’s just that it’s redundant