Because... I think I could actually fucking DO some rudimentary gardening if that was all I absolutely NEEDED to do to prep the ground.
I have a notorious case of what the gardening community would describe as "gray thumb". The only plants that thrive within my domain are the invasive unpleasant ones that make you sick. If I can externalize and cut myself out of the process as much as possible, maybe then something I actually want to grow will actually grow...
You need to usually wait quite a while to plant in the place the cardboard is while it decomposes. But in the meantime, it serves as a weed barrier, and people typically cardboard between the places they plant
This makes it sound like if I want it to be ready for planting by spring several months from now, I should lay the cardboard and spread the wood chips basically right now!