Coming from Mavericks, El Capitan is an infuriating nightmare: 1) Simple keyboard commands like Command/Option/W no longer close all windows 2) Spell checker goes nuts - when I type the PDX city abbreviation into an airline website, the spell checked changes it to PIX 3) Requires constant clicking on the green window resizing icon to shrink the existing open window in order to make the dock icons and other desktop icon visible so that they can be clicked on. 4) Requires constant clicking at the top of the open window bar in order to make File, Edit, View, etc. visible. 5) The Preview application has radically changed - it's no longer easy to draw horizontal lines, circles, squares, etc. Since the passing of Steve Jobs, user friendliness has been fast vanishing from Apple products.