For me this easily is the biggest take-away irrespective of how simple or complex the task. Obviously as you explain there is always a judgment call with the effort you put in. But then when you look at one of the equations for Power it is work done over time. Given the time we have is limited then it makes sense that you would tweak the equation accordingly. Besides one of the arguments for automation is that it frees up our energy and capacity to be more creative and do other work.