My late 2011 Macbook Pro is what I am using to reply to this comment. I can even do some light gaming on this still if I so choose. Plenty fast for anything web(including streaming video), coding and certainly email. I actually cannot bring myself to buy anything new because the mild bump I might get will hardly be worth what I have to pay to get that bump.

The difference with desktop operating systems are that applications almost always work for many, many releases. This does not seem to be the case with iOS.