Vets and feline behaviorists agree: scratching isn't bad behavior. It's a natural need that lets a cat mark his territory (through the scent glands in his paw pads), stretch and feel secure. Without the right surface, he takes it out on the couch, and stress sets in.
The official guidelines (AAFP & ISFM) list access to a space to scratch and rest that carries his own scent among a cat's essential needs. That's exactly what The Tubby Tabby Nest brings together: natural fibers that pick up his pheromones, a texture to scratch, and a calming "den" shape.
Sources: AAFP & ISFM Feline Environmental Needs Guidelines (2013); Journal of Feline Medicine and Surgery (2016).