I know, I’m an electrical hobbyist. Most 10mΩ resistors (no space because it’s an adjective) are SMD because leads would introduce significant resistance that changes when bending. Unless the wire is the shunt, of course. They have large pads and are thick to accommodate the current and power dissipation because their main use is measuring current in the order of A.
Meanwhile, 10MΩ ones are usually THT and normal size, the occasional ones rated for multiple kilovolts or spikes of even higher voltage are longer to prevent arcing.