People still ask around before they hire somebody. Then they pull out their phone and look that business up. A referral can lose the job if another company explains the work better, shows more proof, or is easier to reach.
That matters when someone is new to the area, comparing businesses in nearby towns, or spending enough money that they want to make sure they are calling the right person.
The website should settle the basic questions quickly: what you do, where you work, why you are credible, and how to get started.