I can claim for sure you never touched a Motorola Droid 4 pichlo,
its slider is incredibly bad.

With the N900 I give it one quick push with the thumb and it clips into the open position. One quick push with my index and its closed.

With the Droid 4 I have to force it all the way up, and it constantly changes in resistance on the way.
To close it I need to use thumb and index of both hands.
And that describes the better one of the two i own.