Apparently I can't post anywhere but this thread for some reason, I have tried multiple locations to put what I actually wanted to say, so I'll just say it here and a moderator can sort it out...

I was in que for over 30 minutes (obviously as a DPS...) and to keep myself occupied I was doing Levequests on my Miner. I was almost done with the Levequest when my acceptance to the dungeon window was counting down.
I finished the Levequest but there's a solid 6-7 seconds of a complete inability to perform any action what-so-ever as the DUTY COMPLETE icon appears and it prompts you if you'd like to turn it in.

This feature is terrible and should have been fixed years ago.