I honestly think it stills explains it pretty well. Most casual users will not download a specific client and will be fine with the whole idea of an instance being tied to its user interface. It still explains pretty well that it doesn’t largely matter what instance you sign up for and that any instance can talk to (mostly) any other instance, just like with email.

So yea, I still think it’s a good analogy. It’s not perfect but yea, that’s to be expected from an analogy.