Concert videos are poor examples.... Fact is, including all the videos above.... they use Omni directional mics..

The sound guys do not want to depend on the singers... they need the control, so Omni directional works best..
Can you imagine motioning to the artist to get closer to his mic ... during a concert

It doesn't matter where they move the mic, the sound guy has all the control..

It would be a total nightmare to have the singer in control... other than their vocal ability.

Active entertainers have no choice, they move around or dance and can't be close to a fixed mic.. they need a headset... and it needs to be wireless... you can find a zillion artist in this category too..

Madonna as an example.. or any broadway show..