We suggest SSL certificate adoption for many reasons. Security and user experience are among them but most important, because it is a crucial ranking indicator for search engines.
Even though you have no intention to offer payments or gather personal information in your site (for example), it affects your website marketing and SEO. However, if you are not interested in the feature, you can dismiss the suggestion, snooze it for a week and keep improving your site with the next one!
Take a look at this article published by Google for further information.
