In a big company (particularly in highly regulated industries) it can get very difficult to measure employee output because quite often an employee may be block

In a big company (particularly in highly regulated industries) it can get very difficult to measure employee output because quite often an employee may be blocked from completing a task because of regulatory requirements, company policies or scalability considerations - This sometimes forces employees from one team to coordinate with other teams who are working on a project dependency and can lead to busy-waiting. Sometimes employees can be moved onto other temporary tasks while the other team completes their task/dependency but this causes the employees in the former team to lose focus - Making employees context-switch between too many projects carries a cost which may be higher than just allowing them to busy-wait from time to time.