FireWire
It was bad when the MacBook Air came out without Ethernet, but there's possibly even more controversy over new MacBooks coming out without FireWire. FireWire is relied upon by photographers and video editors for its high data transfer speeds.
Perhaps one reason behind this was to make the divide between MacBook Pro and MacBook a little more obvious, particularly in light of the new MacBook's improved graphics and design.
Honourable mention: IBM chips
Macs used to run on IBM processors up until a few years ago, and it meant you couldn't run Windows on a Mac, which was inherently bad for Apple's business. You may think, "Dude, what the eff? That's like saying the problem with wearing a helmet is that you can't get stabbed in the head!"
But by switching to Intel chips, Windows could now be dual-booted or run in Parallels, and all your essential Windows apps can be used, when needed, on a Mac. Getting rid of IBM has been nothing but a benefit to Apple.
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