Not sure I fully agree. The features we're talking about here are in the developer space, not the end-user space. When a browser maker implements a brand new w

Not sure I fully agree. The features we're talking about here are in the developer space, not the end-user space. When a browser maker implements a brand new web standard, I don't think the correlation with new end-users is that strong. It takes forever before any new standard is popularized and widely used. Check release notes of browsers, almost all features no user will ever directly experience.