Harsh glare from sunlight is one thing, the usual camera directly on the eye, the other important argument for an optical viewfinder. Traditional and personalized photography is for many still directly through the viewfinder.
Since it is not a SLR camera but the subject via sensor on the display, there is no way the way through the lens to determine motive to choose in an optical viewfinder - in contrast to the electronic viewfinder.
Of course, and it never did this has always been a so-called parallax shift, so inaccuracies between the viewfinder image and the actually photographed area. In this way and you have to live. After some getting used to but you quickly get the hang of and know what area you photograph and underestimated the benefits of the viewfinder.