A handyman is just one person skilled with just the use of basic tools for carrying out minor plumbing hassles. Handymen are good only for fixing minor pipe leakages or drain clogs. Anything severe than that will need complete professional assistance.
Some plumbing problems, when left unattended, can cause severe health problems. Therefore, professional plumbers assigned to the job are trained and skilled to tackle adverse situations easily.
Plumbing businesses train their team of plumbers to use modern tools, equipment, and appliances to speed up their respective jobs at ease. Hence, this is something that a handyman cannot help the customers with.