Wood sucks for aeration or for breaking up soil. It’s extremely slow decomposing unless it’s the softest of the softwoods. It’s high cellulose is what keeps it together. It’s good for growing certain fungi. But bark used in landscaping is an insect magnet. Grasses also suck for the same reasons as wood. Great for ruminants. Not so great as a soil additive and should be used in small quantities in compost.