Comment to Make Your Quill Editor Bar Sticky
Class selectors for unique design would be a nightmare. Especially if they would all look similar (class is usually just for design, where ID is for unique identification of an element).
It has always been a blessing for me. That old WP CMS... many themes use a lot of tag/category/page title css selectors. It makes CSS customization quick and easy. But, that's just what I'm used to.