I am a long time mac user and I agree with all of their points. I guess you disagree, but I am not sure why you are being dismissive. Each point is a legitimate criticism from many peoples' points of view.
Also: I don't use Mail.app.
And dismissing the asinine removal of the "get mail" button from Apple's default E-mail program because YOU don't happen to use it isn't exactly respectable, is it?
Mac OS DID satisfy a great many people; I've seen no credible (or even incredible) argument that the recent raft of faffing about with the UI has brought new users into the fold. That's the foundation of so many people's outrage over it: The changes offer no improvement and don't address any longstanding user requests. But it IS demonstrably regressive, and subjectively dated and tacky.
"Transparent" UI came and went 20 years ago for good reason.