I think the introduction and mainstream of Dark Mode on mobile devices was a major breakthrough. Sometimes I wonder how we were able to cope without dark mode. It must have started because someone or some people wanted to make experiencing web or apps better for people who have limited visibility. Today it is widely adopted and has made using of devices easier. Adoption of dark mode device wide in both phone and laptop operating systems is a great thing for me. Not because I have a visual impairment but for the comfort and calm is brings when using an app or website.