Etches are embellishments , they sometimes look very appealing or else awful according to your taste. It certainly requires some extra time in the finishing process but it adds presence, looks, brand or makes a statement. Think of the Crown Lifter etch that GEC came up with some years back, looked tasteful & amusing and was a clear dig at the then very fading Queen Cutlery.
If you have a carbon knife as a user which you patinate or regularly polish, the etch and its position is immaterial. For collectors of the pristine, preservation is everything
Had some stainless knives with etches I dislike and that's a chore getting them off !