And it becomes something everybody keeps their ships away from.
You just don't get it do you.
That's the whole point at the size you're talking about, there's pretty much no where on even a 3x6 foot board that you can get away from it.
Range 5 will be 500mm or 1.6 feet. You put a 2x1 foot ISD in the middle of the table and you're left with a 5 inch strip on the short edge where it can't reach. That means about 95% of the table is in range... How exactly do you keep ships away from that?