There should be division of labour in the workplaces to avoid interference with other people's business or job. Most people hate it when some other people tend to interfere with their jobs...
Division of labour works so well in workplaces. It breeds work efficency and it's the reason why I encourage it in any kind of business. I have division of labour in my business with the 6 workers I have under my employ now. It's the way they deliver very well.