I believe the system's always worked like that, even with the recent updates to be able to search for matches via either set, player, or team.
What I end up doing in those cases is to look at what they have on their trade list by going through the collection link. When we hooked up on a trade that's what I did to make sure I got all the matches with you.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis