You often need to use a graphical application directly from the server. The main example is a browser.
"Firefox" starts exactly like "firefox --no-remote". Notice that the launch is very long (up to half a minute!) without any notice.
This setup is usefull to use internet services that scans ports to find vulnerabilities, but are accorded to the IP and gives graphical results (so using w3m is not convenient).
Like this one: