Why you say? Because I've never had a cat cut tarp. I tried a diamond setup on my garage approach a few weeks ago. The cheapo tarp I had for covering firewood was maybe 8'X10'. It took up a lot of real estate. What size do you use in the diamond?
I know many love the tarp as when not needed, you don't have to set it up. Next adventure I guess. A friend used a "footprint" last night as his shelter out snow camping in the Bucks Lake Wilderness, in a raised, diamond cover. He used a bivy also.
Duane