While I agree a lot with what's being talked about here, I think perhaps the best fix for everyone.. would be to have seperate instances of the diadem via duty finder.
Q in as a gatherer, or q in as a battle class. Only allow members to switch their gathering class, take out monsters, take out the attunements and let everyone do their own thing.
Would take out all the issues, and give everyone what they want without the time alloted to wait for people to /maybe/ join your pf so you can q.