what does that have to do with anything? the current state of things isn't an argument against changing, lol.
if you went around following that logic you'd just keep sitting on the toilet forever because, well that's what you're currently doing so hey why change it?

Yolngu. Most people travelling to Yolngu country don't attend any kind of immigration process. Not even a Welcome to Country, although they should. So you can argue the borders aren't completely open because there's a process that exists, but nobody faces any penalties whatsoever for breaking it. And it's not designed to keep people out, it's only designed to ensure people understand the local cultural protocols.