Agreed, it is a novelty thing. I put my substrate all over my 36x54 inch bed and using my two linear red dots it is where I want it. Camera wouldn't be nearly as accurate on large bed. Same as the English Premier League spending 5 minutes seeing if someone is offsides with a picture that has all sorts of issues with distortion from angles.
Woodworking, Old Tools and Shooting
Ray Fine RF-1390 Laser Ray Fine 20watt Fiber Laser
SFX 50 Watt Fiber Laser
PM2000, Delta BS, Delta sander, Powermatic 50 jointer,
Powermatic 100-12 planer, Rockwell 15-126 radial drill press
Rockwell 46-450 lathe, and 2 Walker Turner RA1100 radial saws
Jet JWS18, bandsaw Carbide Create CNC, RIA 22TCM 1911s and others