Yes, a theme is necessary when using website builders to create a website. A theme is the appearance of a website and what visitors see when visiting a website. However, visitors will abandon the site if the theme is unappealing or if users cannot locate essential information quickly. Additionally, a website with an unintuitive theme may have a negative impact on the conversion rate.
Selecting a heavy theme may slow down the page load time, eventually damaging the website’s indexation by search engines. However, users must select a theme that is basic, mobile-friendly, appealing, responsive, quick to load and cross-browser compatible.
Similarly, users will require extensions or add-ons to customize a theme’s design and functionality.