I'm saying that WebKit can't be a monoculture because Safari only has 14% market share. It doesn't matter if other devices and browsers that no one actually uses are WebKit.
Gotcha. Yeah, it seems a lot of people are stuck in the past idea that WebKit dominates. It used to dominate in mobile and it certainly a lot of WebKit-only extensions eventually became standards — but those days are behind us for everything other than iOS.
And while iOS has the greatest market share for mobile, you're right, WebKit doesn't have the greatest market share for general browsers. That's definitely Chromium, now on Windows, macOS, Linux, iOS, Android, your mum's toaster, just about every 'native' web app…
Side note: I guess we should really be saying Blink, that's the name of the engine. But even if, say, you use Google Chrome on iOS, backed by WebKit, that usually makes you a Google Chrome, backed by Blink, user on the desktop.
