Re: An analogy
I also have a couple of mechanical watches, one is self-winding if I wear it all day, otherwise needs wound up daily. But the thing is, I don't have to carry a special winder with me, nor do I need an compatible power point for the winder.
My usual watch is a Casio that is automatically set by radio and is solar charged. Had it now for several years and no battery change needed (and resulting leaky seals) so pretty happy with it. Now if a smart watch could do the same...