Companies may believe that an employee should complete multiple tasks because they are looking to maximize efficiency and productivity. With the evolution of technology and automation, some roles may be expected to take on additional responsibilities. Additionally, some companies may try to keep costs down by minimizing employee headcount. While it may not be fair for one person to do the work of multiple individuals, it is a common practice in many organizations. The perception of high salary might be seen as a drain on resources, leading to the expectation of higher workload to justify the compensation.