You know, in over 20 years of living with cats and as far back as my memory goes, I can only think of one cat that tried to scratch furniture. It was new and didn't smell right to him. A few squirts of a icky smelling perfume kept his paws off the corners of the couch (and me off the couch entirely ) and that was that.
You'd think that my furniture would be hanging from the ceiling fan, LOL. I currently have 18 cats in the house, and only the one is de-clawed. And I really don't make much effort to keep them from scratching the furniture. Of course they have scratchy pads and posts and climbing things, and they mostly scratch those things. I guess couches aren't much fun if you have a floor-to-ceiling cat tree to destroy.
When I went to pick up Scrappy and Sammy from the vet after their neuters, they let me go back to the kennels to pick them up. There was another kitten there who had been neutered and de-clawed. My boys were just lying in the kennel looking bewildered and dopey, but the other kitten was screaming and throwing himself around the cage, and there was blood smeared everywhere. Ugh, it was horrible. Poor little guy.