That feature ALREADY EXISTS, and it's called "Player Search".

But once a duty finder is set in place in any MMO, people simply forget or don't bother to use the manual party-making assist tools that are in the game.
Seen this in TERA, seen this in WoW, seeing this in ARR now.

I wonder why that happens, once the game has an auto-party matcher, people simply forget the other tools at their disposal.