If your business is selling products, then an ecommerce website is almost a "must have" in today's world. Everyone wants everything "now". Some people simply don't want to go to a store, some don't want to deal with salespeople, some just like the ease of online shopping and being able to compare products across multiple stores in seconds.
That doesn't mean an ecommerce site is the right answer for all businesses. If you have complex products that require explanations or custom designs, then you need to speak to your customers before they place an order. For all "stock" type items, an ecommerce website is another sales channel that you can leverage to reach customers that wouldn't physically enter your store.
The ecommerce websites we build are designed to be as simple as possible for you to manage. Adding/changing/updating products is easy. You can accept credit-cards, PayPal, Apple Pay, etc. and it is all built into the site.