For example we are modeling a modular building that is identical on the 1st level on another building we've already modeled.
3D view when trying to copy all those wall groups over, i have to manually select them one by one and the filter button doesn't help because it bunches all the groups i have in view to "model groups"
Pretty much categorize model groups to what they are.. So a mech, electrical, or structural groups etc. This would be huge for efficiency and flow.