What is the primary role of the accretion disk in the collapse of stellar material?

Answer

To allow the collapse to proceed slowly and steadily by parceling out material

The accretion disk acts like an invisible brake, forcing the material into a pancake shape that allows the mass accumulation onto the protostar to proceed slowly and steadily over millions of years.

What is the primary role of the accretion disk in the collapse of stellar material?
protostarstellar evolutionstar formationastrophysics