Liquid-cooled motors are widespread in many applications already and technically it's not something complicated. Furthermore, high torque, multi-pole motors (assuming you want to direct-drive a cutting head moving at 2-4 RPM) have little to do with with the kinds of motors used in cars.
Tesla was forced into that technology. The original Roadster had a two-speed transmission and an air-cooled motor. The huge jolt on the transmission when it shifted during acceleration wore it out in months. So Tesla had to develop a motor with a wider power range that would fit in the original space. That forced them to liquid cooling. Previously, liquid cooling an electric motor was considered unnecessary complexity; just make it a little bigger and use air cooling. Now, it's common for electric cars and is being used for electric powered aircraft.