Because no one really cares about doing better than Safari, mostly because the amount of users is small and they all consider themselves better browsers. Apple

Because no one really cares about doing better than Safari, mostly because the amount of users is small and they all consider themselves better browsers. Apple or even Webkit never made any kind of waves about it themselves either. However, Microsoft is pretty big. Edge is the default browser on Windows, a platform that has a significant amount of users, and they're making quite some noise in the area. Others have taken notice and are at least ensuring they keep up. Which is good, we all benefit.