Do you mean real time like games? “Wireless” headsets are perfectly fine and usable. Real time audio? Wireless transmitters and receivers exist and are used (granted with wireless in-ears but IMO that’s mostly so the don’t fall out) at the absolute highest level of audio production and live events.
You definitely can’t just say wireless isn’t used for real time.
Real time audio exists for sure. But it doesn't use Bluetooth, and nobody here cares about it, not to mention the amount of investment needed for equipment.
This is just being pedantic.
Gaming headsets are usually 2.4GHz wireless, and pro audio stuff is ~500-800MHz and the proper stuff requires a wireless license to use.