My server hosts only three people including myself, each one on its own domain, yet I can talk with everyone else on any other server transparently, without any

My server hosts only three people including myself, each one on its own domain, yet I can talk with everyone else on any other server transparently, without any issues. And even if I decide not to host this server anymore, I can easily switch to another, import my roster and still talk to the same set of people. So, answering your question: very helpful.