That kind of defeats the purpose of having software controls. You can as well unplug the whole thing or remove the battery violently on a laptop and claim "it's still as straightforward as before!".
How do you interact with software? With keys/buttons. Think of power button as another key. Microsoft conditioned all of us to never ever touch that power button, but it is all right now. I promise.
The power button is a software control. It generates an interrupt, and the operating system shuts down the computer. For all purposes, the exact same deal as if you hit the software power button.
Which is what finally got me to start using the power button, which is still just one action.