I was thinking the exact same thing about the VS on a jointer. I had a Sears 6" a while ago and never ever had a problem using it. It ran at full speed but was slowed/regulated by the size of the pulleys that came on it. I never gave that a thought. I just used it.
As for the table saw, well, if seeing a flying board shook one up, I would never ever use a lathe. I was in high school shop class many years ago and a guy was turning a bowl on the lathe. Something happened. I know not what but the bowl blew apart and the largest chunk of it went through the dropped ceiling. made a heck of a noise and scared the you know what out of all of us. There was also the time that the shop teacher made a stupid mistake by trying to use a router while standing up on top of one of the work tables. He stepped back and fell off the table. He did manage to "throw" the router away from himself but it taught me a lesson about routing. Always be thinking about where that spinning blade is and what direction it is turning. Most accidents can be prevented by the use of COMMON SENSE.