I tried the block face a few time on some small deciduous trees to test the enhanced folding capability, but I wasn't enthusiast with the results due to a collateral effect:
Each time, I got exactly what I feared before hand, as the partial loss of the aiming's accuracy. Maybe I did something wrong, like too thin of a hinge, but the fibers split only at one side instead of all the width, following a triangular shape across the hinge ( bottom left to the top right of the vertical cut for example). It worked as if I made a slanted hinge and I get a substantial drift in my lay.
This phenomenon should be less apparent with a big tree ( high of the block cut vs width of the trunk) but I would like to figure it out.