The idea is that it's designed to prevent that very problem. Since you can click with your palm, one finger or all your fingers, it reduces repetitive strain. RSI is why they haven't put a scroll wheeel in their mice either.
Apple sticks to a single button mouse because in test after test, complete computer illiterates find it easier to grasp the conecpt. Add to that the fact that Mac OS is designed with a single button mouse in mind and it isn't such an issue.
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