Shaheds are heavy and big and I doubt that the new laser system can damage them. An interceptor drone is much cheaper and effective against them. This is more like defense against smaller FPV drones targeting bigger anti-missile systems.
Lots and lots of drones--it's just the drones were all picked off, the only things that got through were some of the ballistic missiles. Most of which were aimed at things that they shouldn't have been shooting at in the first place.
And Iron Dome scored on the ballistic missiles, I would assume Iron Beam also could. When it's coming down on it's target it's slowed by the atmosphere and it has no defense other than being fast.
The Iron Beam is not relevant against ballistic missiles.