A quick follow up, I installed that plugin and it does put the two legacy pages back for client and server.
Unfortunately it looks like the plugin will his EOL as of 26.1, so hopefully they get this either MUCH better documented, or add in better wording for the sections of the current instance page.
Unfortunately it looks like the plugin will his EOL as of 26.1, so hopefully they get this either MUCH better documented, or add in better wording for the sections of the current instance page.