Needs LFD Tool
you are right. There are a lot of topics about this and it seem A-net isn’t too concern about it. It was a hard time to find people to play with in GW1 too. They were looking for specific build so they always kicked you out if you rolled a different one.
Make a hot-join dungeon system and then no one will be discriminated.
Its good tho, the dungeons are not mandatory to finish the game personal story