Well, its a good trick when you don't have a lot of room for the saw bar, chain and wedge in the back cut on smaller trees. If I have the room, Ill often bore the back cut and hinge like you would for a head leaner that might barber chair, wedges in behind the hinge from the sides. But even then you are more limited on your room to place wedges before you trip the tree either finishing the back cut moving through the back of the tree or tripping the back strap for the outside.
The method you are using gives you more room and less dependant on the diameter of the log. Also, wedging from the side you have to be cautious as to not pop your hinge, Your method prevents this as well.