I suspect it’s more about the chance of electric shock when disconnecting and reconnecting the tubes. I’ve been a zapped a few times and it’s quite painful. If you’re advocating someone else does it and they have a weak heart then you’re in all sorts of trouble.
It’s less of an issue with generic laser cutters because they have generic tubes and you can get them from anywhere. I get the feeling you’ll need a special GF tube for these machines and by supplying them GF has to take responsibility for what happens when people change the tubes.