Only good if you and your communications partner use Tor. Otherwise my ISP/your hoster knows we are communicating whenever my IP connects to the SimpleX/XMPP ports of your server's IP.
If I connect to Signal servers there are so many potential users I might be texting it is harder to track from the outside.
You can use tor, but xmpp doesn't leak metadata like signal and simplex is solving it with the next version. Relying on signal is a temporary solution and doesn't give you the freedom to self-host
But if I have my own xmpp server and you also host your own and then there is a connection from my xmpp server to yours on the xmpp port. What does that look like to a network observer?
