A cross server dungeon finder is definitely NOT "standard functionality."
Although, I think we should take his opinion with a grain of salt; no disrespect to him of course, but he's for both a dungeon tool and cross server. It's not exactly a wonder why he believes it's a standard.
A same server finder would be fine and even that isn't necessary at the moment. Just a channel for LFG that is only accessed when you set yourself as LFG.