I am not certain there is any truth to the slashdot implied claim that both the WIFI and BlueTooth radios are still somehow active; They are not active. You follow the slashdot link pathway back and you find the source of all this hoopla is this:
An anonymous reader writes:"With Apple's new iOS 11, you can't completely turn off Bluetooth and Wi-Fi from the Control Center. This is not a bug, but a feature."
The rest of the complaints slashdot is referring to are others reacting to the anonymous poster.
There is no evidence this is at all true that any functions are still running for WIFI or BlueTooth. The same functionality accessed by these buttons is part of the Airplane button function: the Airplane button turns off all radios, but it does not switch off the functionality of the Settings. That remains available, once you turn them back on, instantly. These two, the WIFI and BlueTooth switches are just subsets of that. There is ZERO reason, for example, to leave Bluetooth operation on when the user elects to switch it off. The BlueTooth radio is OFF. Nothing is being sent or received. It is a simple step to go to the Settings and turn those functions off completely if one desires that to happen.
This anonymous user probably noticed that using the Control Center button did NOT switch the entire WIFI Settings or BlueTooth toggle to OFF for those two functions. It never has. It was never intended to switch them OFF. The Control Center buttons are a temporary switches, never intended to be permanent switches, they're intended for momentary ad hoc usage. SHEESH!