I like using “tap to click" on my Macs. This preference setting lets you click by tapping a finger on the trackpad, rather than actually pressing down for a mechanical click.
Funny thing about this setting: Apple emulates the original Magic Trackpad behavior, complete with limitations of the physical click.
Prior to the latest Magic Trackpad 2, all of Apple’s trackpads were mechanical, with a hinge at the top. With these trackpads, you click by pressing down on the pad. The lower on the trackpad you press, the easier it is to click due to mechanical advantage. You cannot not click by pressing near the top; you have to click further down.
With tap to click, Apple emulates this behavior. Tapping toward the top of the trackpad will not register a click!
I’m surprised this behavior wasn’t eradicated with Yosemite’s “flattening.” It’s the gestural equivalent of the 3-D button — a throwback to the mechanical process of pressing down on the trackpad. I don’t know if you can describe a gesture as “skeuomorphic", but the words seems appropriate.
