Look man I’m not a sciencologist but if a big ol tree smacks into that strap maybe the strap doesn’t break but the metal tie downs? Idk man doesn’t seem like it would work out well for the house or straps
A 2" wide straps is supposed to fail at about 10,000 pounds/4500kg of static load. The nylon strap will fail long before the metal hardware does, and the roof is going to fail before either of those do. If a large enough object fell on the strap, the most probable scenario is that the strap would end up acting like a wire cutter to the roof.
You could use those straps to lift a large tree up in the air with a crane