This is not true. If you are a desk jockey then maybe you don't need rivets, but they (along with all stitching besides the back pocket stitch design) certainly

This is not true. If you are a desk jockey then maybe you don't need rivets, but they (along with all stitching besides the back pocket stitch design) certainly help keep your denim together if you are the least bit hard on them. Ripping off pocket corners or blowing out crotch stitching is something that happens. And I'm pretty sure Levi's also offers denim with non contrast stitching.