The OP says: "Each browser should focus on innovation, not parity." If that's the case, developers won't bother using those shiny new proprietary features. We

The OP says: "Each browser should focus on innovation, not parity." If that's the case, developers won't bother using those shiny new proprietary features. We're in the business of making products, and there's no way most people are going to waste their time adding tons of browser-specific features. The fact that the browsers don't have parity is probably the most time-consuming thing about web development.