Shaving using only water is just scraping your under-lubricated face with sharp metal. Most razors put a token hydration strip after the blades for reasons known only to them. King of Shaves added a hydration strip before the razor to give people a smooth shave even when they're only using water.
I made a couple of videos to show how an extra bit of hydration helps without showing models stroking each other's smooth, smooth chins.