GRBL is the firmware running on the little board on your machine. Because it’s sold as a CNC machine, it’s configured for CNC use by default. “Laser Mode”, which is mentioned in the above post, tells the controller that it has a laser attached, not a spindle, so it doesn’t have to pause to let it spin up to speed, but it also has to turn off during rapid moves, which a spindle doesn’t have to do.