Compressors are quieter, more efficient and more reliable than ever before.
1. Since the gas volume is reduced, the heat is concentrated in a smaller area
2. Internal motor heat and friction losses are carried off in the discharge gas.
Since all hermetically-sealed compressors have their own internal electric motors, it's easy to understand why the returning gas must be cool. This is what keeps the motor windings from overheating. So anything that causes the returning gas to be too superheated (like a loss of refrigerant charge) will likely reduce the life of the motor. In fact, almost anything that goes wrong with the system adversely affects the compressor life.