It's a chicken-and-egg problem. How can you get web developers to test their websites in Safari, when the majority of Mac devs haven't opened Safari in ages? We have the answer already. Safari doesn't compete on it's own merit.
WebKit is a second-class citizen on the web, and we can argue about why that is, but nobody can sincerely deny it. Apple's strategy has been dead in the water for over a decade. iOS lost.
WebKit is a second-class citizen on the web, and we can argue about why that is, but nobody can sincerely deny it. Apple's strategy has been dead in the water for over a decade. iOS lost.