Waiting for Diadem takes for ever on Chaos Datacenter and Partyfinder isnt much faster.
Also its still problematic for people who come there to kill monsters.
Most of the time 4 or more people will go gathering in the normal que.

And before you say Diadem is obselote! You still need those mats for the Relic Weapon and those fish for one of the best bufffood. Also its a good place to gather Birch Wood.

Greets from a Diadem gatherer.