Why does DF decide to END the party ???

If your in a DF group and if that group just somehow turns out to be
the BEST group you ever had using DF then why oh why does DF end the session after a WIN.

It should offer the GROUP to retry / play again without being kicked out.

Seriously.. Example you run Ifirit HM and you OWN it with the group your in.
The WHM in party gets the weapon drop. Rest of group still needs weapon..
Why cant the group hit a Retry option ? This needs to be done ASAP.