What is simpler than raising the viewfinder to your eye and looking through it? The physical frame makes the composition easier to envisage than the one in your mind's eye. There's no need to press the shutter button every time. Now and then looking through the viewfinder will reveal something that had been hidden in the clutter of all over view.
This shot is no silk purse, but neither is it the sow's ear that the uncropped frame was. It is a picture that raises questions. And it's a picture that I doubt would exist had the camera been in a bag at the time I rounded a corner.