It's just an example. I've worked with industrial laser cutters (100+watt CO2) before and even with all of the protective equipment built into the machines, you still wear glasses. The idea that you could use something like this in an exposed way is crazy to anyone who's actually worked with them. Any mistake is instant and permanent. You can't make a consumer product out of this. Maybe like a large box that only mosquitos could enter but at that point, you have easier methods than a visual system moving a laser to mm tolerances.