A3 lasers certainly exist. But A3 is not wide format. I've never heard of a true wide format laser (A2 and larger), and I suspect the technology doesn't exist

A3 lasers certainly exist. But A3 is not wide format. I've never heard of a true wide format laser (A2 and larger), and I suspect the technology doesn't exist to make an affordable one. You'd need super-precise optics, an absolutely huge toner/fuser system, and a supply chain for all of the above. And there would be limited sales. Wide format printers are used for high quality art/photo printing, signage and ads, and sometimes for fabric printing. Lasers are optimised for office document printing. You don't often need an A2 or larger office document. And when you do - cartography and blueprints - you're probably going to use a plotter.