1 - Apparently there are limited instances, as in a lot of parties are waiting for others to finish their dungeon or raid, so new teams can join, this is why there can be a wait time if you queue up as 2 tanks 2 healers and 1 dps. for like any turns and so on - While this might be a problem, this wasn't exactly what I wanted to address.

2 - I don't exactly know how to explain this, so I'll type it this way. When we commence for duty finder. 3/3 tanks 6/6 healers. 14/15 dps - 1 member has failed to commence, everyone returns to queue - And then there is a risk that the group you just "queued" up with insta gets queue to another group - and then you can wait there 5-10 extra mins, for find new healers / tanks.

Either. Reserve the group so people who fail to join can immidiatly join again with a new "Missing" players. or allow everyone to join the duty - so the last remaining missing player can auto join on his/her own.