It gets you slow....gets the power in....gives you lots of time to look for wires, obstacles, and if landing to a roof top allows you to get to the deck if an engine quits.....or so it was explained to me years ago by an Operator i worked for.
I saw it as prolonging the agony if something were to go wrong.
I do agree with a steep approach but with a normal rate of descent rather than the very low ROD as is used by some of the Operators.