It was reforming them due to the wet weather causing them to collapse a bit, it also helps to break some of the clods up.
Our usual method on heavier land is:
Terra-disc
Subsoil/disc
Bedform
Cultivate/re-form beds
Rotor-ridge
De-stone
Plant
On light land we don't tend to cultivat/reform or rotor ridge, the latter is a very expensive past time, costing ?250 per set of tines, they last about 20-30 acres, you then have about 250l of diesel a day plus my labour costs. You're lucky if you can get 8 acres a day done with it as its such a slow process