When jobs roles are specialized, it leads to higher productivity. Workers produce more when they occupy one specialized role. The marked improvement in efficiency is due to employees becoming adept at one specific job as they perform it day after day. Another time-saver is the ability of the worker to focus on completing one job instead of having to switch mental gears and change workstations to do another job. Developing your own in-house specialists leads to industry recognition and research breakthroughs. It contributes to employee status, attracts high-caliber employees and much more.
Source : https://bizfluent.com/info-8083551-job-specialization.html