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Tap to click is annoying because it clicks things that you don't want to click. When your playing games it can be fatal.

That's why you rest your thumb on the bottom to click and just move your finger around to move the mouse; unless you actually tap the trackpad, you won't click anything.

There's a dead spot at the bottom 1/6th of the trackpad to allow people to do this; I always though having the physical button would be better (07 MB in comparison to friend's 10 mbp) but after I got it, I realized how easy it is to use.
 
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