Regarding swapping out batteries. I wonder if the entire guts are not easily replaced. Having watched (no pun intended) the videos showing the machining of the cases, the innards must just pop in it would seem so presumably can just pop out? Maybe easier to swap out than fiddle with if there were a problem. I was tempted to say new versions could be installed too, but Apple will no doubt want to make a newer thinner design in the next year or so.