If ticket not confirmed person need to travel in general coach. Due to limited (4 to 6) general coaches they can't travel atleast with 10% comfortably. Problems with huge crowd and wash room troubles.
If one train with completely unreserved from front to back and coach to coach acces facilty runs in every long routes it helps to distribute the crowd uniformly . All persons can adjust seats (no berth option) and can travel atleast with 60% comfortability.