I feel the current automated matchmaking doesnt work for two reason.
1) you are put straight into the match lobby and have to wait for other players top filter in which will lead to people constantly leaving and joining.
2) It is inconvenient to have to go to the strike on the map to physcially access it.
GW2 could I feel turn this into something similiar to FFXIVs system as stated above jsut by using their current PVP matchmaker system just for pve content. It can try and diversify classes so you dont end up with all of 1, they could also implment a feature if needed where you select a role before queing (support, tank, dps.)
Honestly I wouldnt mind seeing this in other places such as fractals/raids/ and dungeons aswell.