Most professional microphones have an XLR connector which allows high quality audio signals to pass through the cable. Unfortunately, most computer don’t have a native XLR input jack. Even if they did, most XLR microphones require a higher level of power than computers can provide to capture such high quality audio signals.Can you use XLR connectors for stereo signals?
So the recommendation is really not to use XLR connectors for stereo signals, unless it is for a special one-off purpose where the lack of balancing doesn't matter, and the convenience factor outweighs anything else. In fact there are such things as 5-pin XLR connectors.