I remember seeing a presentation by no other than Bill Gates on such an idea. A long time ago. It had merit, it was the feasibility, safety, and cost that kept it from being a thing.

A related side note - I returned a gift once that was a ceiling star projector. Was pretty cool, but I quickly realized that to get the proper spread on the ceiling it had to be low, which meant anyone looking at it in passing would get hit by the LED light. I questioned if that on a regular basis was safe, since the same type tech in scanner has warnings not to look at the emitter. In the return I left a comment on that point, especially such a device would be attractive to get for kids. The connection - friendly fire from a laser that’s strong enough to fry a mosquito at distance is probably not a great thing to have in the house if you’re home.

This is brought up in the article with the programming detecting other things around and stopping the firing if seeing something. But knowing how well vision can and can’t work, and the creep of AI to such things, I’d rather not try it out.