My extensive experience as a wearer of glasses is that it is varifocals that are the hardest to live with (I am short sighted, with some astigmatism). Particularly if one is is engaged in things that require some peripheral vision (e.g. ball sport, driving, flying etc). The problem with varifocals is that they only focus straight ahead and anything to the side of that central (up/down) band is not just out of focus, but (especially looking down and sideways) distorted. This means that to look at things to the side of centre (even a little bit) requires one to turn one's whole head to move in the direction that one wants to look. Bifocals are much easier, they don't give the continuous up/down focus of varifocals, but they don't distort when looking outside of the central focused "belt", so a quick flick to the right or left just happens naturally. I am lucky, I don't need a strong prescription and only distance and reading. Middle focus (which I am using for typing this) needs no glasses at all. YMMV.
If such glasses are to become successful then they will need binocular eye tracking (and probably some kind of brain interface as well [for focusing cues]). Then the glasses' centres will also have to track each respective eyeball's focal point as well. Then (and only then) will the "automatic focusing" become useful.