The previous expansion (Hyperion) seems to have only three good points.
The burner missions.
PI now doesn't need sovereignty.
Worm holes now have a kick out which is linked to the mass of the ship.
The next expansion (Oceanus) seems to be quite light in features.
What now seems to be missing from the current expansion release frequency is the anticipation.
Previously we would wait ages for the expansion, it would usually have heaps of features, and the release day would get closer and closer, finally it would arrive.
I don't know if we've lost or gained something with the new system.