I think the worry with a split system AC (household, not auto) is the return to the compressor of liquid refrigerant. A compressor only compresses gasses, not liquids. As the heat load on the evaporator coil lessens, less refrigerant is boiled since there is less heat being transferred to the refrigerant in the coil. At the same time, the outdoor compressor is condensing almost 100% of the refrigerant due to the lower ambient temperature.
Now in cars, you can run the AC at low temperatures and we do for defrosting. A car's split system has an accumulator to collect any liquid refrigerant returning from the evaporator coil before it goes to the compressor.