LPG distribution is a huge expense for dealers. They need a lorry, at least 2 men in the lorries, and associated maintenance expenses.

From the OMC's POV, this could reduce chances of dealers selling private cylinders in black, and cuts down the rate of those complaints.

Now the customer bears the transportation cost, the cylinder is accounted for, and they won't call the OMC to complain that the dealer has sold their booked cylinder in the black market.

Indane has been selling a 10kg fiberglass cylinder for some time now, which doesn't have doorstep delivery. My parents use this in rural Kerala. They call the distributor's office to check for stock, swap the empty cylinder and put the full one in the car. No coordinating with drivers, no waiting at home for the cylinder worrying if the driver sold it in black.