> Having to wait for macOS updates holds back the browser, unnecessarily.

Safari is an operating system component, which lots of people don't seem to understand; hundreds of thousands of 3rd party apps rely on Safari's WebKit engine.

I've never heard a normie Safari user complain that Safari updates aren't being released quickly enough; that's something web and app developers care about… which is why Safari Technical Preview is released every two weeks.

Even the release versions of Safari on iOS, iPadOS and macOS allow you to enable web features that are still in development.