I run a guild event where we take groups through delves to get the skyshard and complete the delve. Delves can be difficult and time consuming for low levels, tanks, and healers to complete solo. Our groups are often quite large. We frequently run into the problem of the group being split into two instances. In the past, both groups could still see where crown was on their map, and we would spread out the DPS to get through the delve quickly. Not ideal, but it worked. Now the group gets split up and I have to try and describe where the skyshard is without being able to see where they are on the map. Keeping groups in the same instance would solve this problem.