I remember for a while, if you wanted to join a party, there was a checklist instead of 3 options (Normal, advanced, elite).
The checklist allowed you to choose party difficulties with a little more freedom. you could check multiple difficulties so you could find parties quicker.
I could check advanced and elite if i dont want to do normal.
Or you could check "join any party" without having to scroll though all three and pressing join each time. It may seem redundant, or just plain lazy, but there are times when a split second could be the difference between being in a party and waiting a week for someone to finally play Operation Crimson Hammer.
If for some reason the checklist was causing bugs, like joining two parties on different difficulties at the same time, then i could see why it was removed. But i don't think it being removed was in any patch notes. why was it removed?
Edit: Oh yeah, my suggestion would be to have the checklist back instead of the 3-optioned cycle.
What about the party finder?