Listing your business on Google is a crucial element of getting customers to you. Without a listing on Google Business, not only will people be unable to find you easily via search, they also have less reason to trust you.
Consumers use Google to find more than just a link to your webpage. The addition of information such as opening hours, reviews, and photos can help a customer make the decision to shop with you. Without those things, they may look elsewhere, so it is very important to put the small amount of work needed in to be sure that when people look for you, they find everything they need to know.