Now I wish that everyone that posts what you quoted reads this and really let's it sink in so I don't have to read it ever again.
Well, to be fair, people are referring in a merging of Springboard and Finder when they say "iOS" and "OS X". Obviously, that can't work. Finder is very much a keyboard/mouse based UI and Springboard very much a Touch type UI. Everything else is basically common between both OSes.