Many are. Scissors, drill bits, even the way most people use a kitchen knife, they put as much force onto as small of area as possible. At certain differences i

Many are. Scissors, drill bits, even the way most people use a kitchen knife, they put as much force onto as small of area as possible. At certain differences in scale it won't matter (razor blade vs a single hair), but how a cut is performed is definitely part of the design process.