Jason Snell, writing at The Verge, instead of his normal home at Six Colors:
As the Mac turns 40, it’s never been more successful — or more irrelevant to Apple’s bottom line. It’s undergone massive changes in the past few years that ensure its survival but also lash it to a hardware design process dominated by the iPhone. Being middle-aged can be complicated.
This is one of the better retrospectives on today’s anniversary.