I don't know what cow-butchering currently entails, but they'd probably be paid significantly less if they only had to press a button.

It's an assembly-line process. Cows are actually killed by blood loss, but before that happens they're typically (kosher meat being an exception) stunned by electric shock or pithed with a captive bolt pistol. Fairly mechanical; I imagine a pushbutton process would pay less, but mainly because it'd then be unskilled labor and its operator wouldn't have to deal with various cow fluids at close proximity.