You are assuming that the group finder primary function is there to help you get black hole comms;
I believe the group finder is there to help casuals and people gearing up. The temptation for geared players to do them is the 5 BH comms.
You can still take an archetype group for quick runs, but I would say that it's working forcing archetype groups is correct.
If you have a pre-made group of 4, it should ignore the archetype requirement.