While it may be wrong in theory, changing it meant that all muscle memory developed by users thus far was thrown out of whack. What was the gain for disorienti

While it may be wrong in theory, changing it meant that all muscle memory developed by users thus far was thrown out of whack. What was the gain for disorienting the users by introducing a new default? An improvement in acceptance by users who had only used tablets and phones but never PC's? Is that a large set?