Safari 10 Demotes Flash, Java, Silverlight, and QuickTime...Good!
Next Steps for Legacy Plug-ins in Safari for macOS Sierra
On websites that offer both Flash and HTML5 implementations of content, Safari users will now always experience the modern HTML5 implementation, delivering improved performance and battery life. This policy and its benefits apply equally to all websites; Safari has no built-in list of exceptions. If a website really does require a legacy plug-in, users can explicitly activate it on that website.
In a world where Google Chrome still has Flash built into the browser, it's good to have a major browser that rewards sites that embrace web standards.