The screen is so small you can hardly see any shared elements with the other OSs. They might share some components underneath, but from a user perspective only the apps’ icons are somewhat similar.
True, but the integrations with Apple Watch are very well done, even if the functionality is not strictly overlapping across platforms. The improvements in user experience caused by this tight ecosystem integration feed into each other, vastly outpacing what competitors without this kind of ecosystem ownership. It’s sad in a way because there is no incentive to build open standards, especially for Apple.
well we're talking about "cross device experience," yes? Messages and WhatsApp and FaceTime Audio "just work" in exactly the way I would expect with no configuration, health features synchronize seamlessly with Health.app on the iPhone (again with no setup), ApplePay… what are you asking for here, Safari or Finder on the Watch?