I've only ever got experience of the unrivalled Snow Leopard, and have updated to El Capitan, which I'm not a fan of, generally. Mostly small things, but still enough to warrant dismay at removal of. The biggest bug the pinch to zoom in everything, Finder, Folders to enlarge thumbs, as well as 'Mail', but can't fathom for the life of me why they'd remove it. And why all the coloured tags when I'm looking for 'Today' 'Yesterday' etc. in the Finder window which was really helpful! Anyway, to cut a long boring story short, has the pinch to zoom returned in Sierra, before I moan about that?