Confusion about how Duty Finder works
I'm curious exactly how it selects which players wind up in a party. Take for instance this example from earlier today:
I want to do Syrcus Tower, so I queue up first on my Paladin.
30+ minute wait time, 1/3 0/6 0/15.
Cool, switch to Monk, queue up.
28 minute wait time, 1/3 0/6 3/15.
It looks like a party just started getting put together, so I hop back onto my Paladin so I can go to Syrcus Tower as a tank. 15 minutes into the queue and it's still 1/3 0/6 0/15. Deciding to cut my losses, I switch back to Monk, queue up, and the party is at 2/3 2/6 8/15.
As we speak, duty finder is now at 2/3 6/6 15/15. Why wouldn't it throw me into a party that was forming when I was queued up for those 15 minutes as Paladin, seeing as how we now need a tank?
Thank you for any insight into this matter!