I also do not crush unless mixing into potting soil or seed starting mix, when I sift it to 1/4”. Biochar is quite brittle, and will break down with foot traffic from people and animals. It also breaks down as birds, worms and others eat it. Heavy rain can also do quite a bit, and I think it may be adapted to hold soil together as it gets caught in post fire floods. Coarse woody debris also holds water exponentially longer with volume. In August, 75% of the water available to plants in an old growth PNW temperate rainforest is in very large pieces of dead wood.
I have looked at biochar under a microscope and it looks like a black hole, so I am wondering how folks above checked for inoculation?