There is a gap in this reasoning though. "X% of employees are not worth their salary" does not imply "mandatory firing X% employees is good for the company". I

There is a gap in this reasoning though. "X% of employees are not worth their salary" does not imply "mandatory firing X% employees is good for the company". In particular quotas flow down into teams with zero percent of people who should be fired. The effect on the remaining 100-X% employees morale is negative.