I put weed block under my raised beds, mostly due to the old blackberry bushes I ripped out, and will probably keep ripping out until I move, and partly due to not wanting the Sunchokes I have planted in there running all over the yard.

On the other side of the house where the soil is bare glacial till, I put 1/2" hardware cloth down to keep the rodents out of the planting boxes. They tunnel through that stuff like it's nothing, the voids between the rocks makes em a nice home. Ground hornets seem to love that side of the house too.