Hmm... That is an interesting point you brought up, I have thought about this a lot before.
And my and answer is yes. They are just tools, used for cutting of course. But some are just better looking or better functioning than others, or both. I think of it like cars, a vehicle is designed to get you from point A to point B, some may do this faster than others. If you take the motor out of a car, it may still be nice to look at but if you cant drive it and enjoy it then what good is it? If it cant go, then its not really are car, its just a hunk of metal that looks like a car. Same for knives, some may look fantastic and have the hardest steel in the world, but if it will not do what its name implies (Knife) then its not really a knife is it? Its just a hunk of metal that looks like a knife.
A cutting tool (knife) can be art, but art that doesn't cut CAN NOT be a cutting tool (knife)