Are wireless power settings actually useful?

The KCM allows to configure power management settings for various "wireless" controller hardware, namely Wifi, Mobile Broadband, and Bluetooth.

This allows to configure things like "Turn off bluetooth adapter when going from AC to battery", presumably to reduce power consumption.

Is this actually a thing people do? Presumably not, because when I need to use Wifi/Bluetooth/Broadband I use them, regardless of whether I am on AC or Battery. Or when battery is low I (try to) get a cable, and don't start turning off pieces of my hardware.

This appears like a feature with little to no practical relevance. If that's true let's drop it