Third-party accessories like smart watches will be able to receive notifications from the iPhone

This seems incorrect, or at least misleading. I have always (since I switched to iPhone in 2020) been receive notifications on my Garmin Fenix watch. In fact, the only problem I have with notifications is that I have no ability to blacklist apps from notifying on my watch, and its all or nothing. This is a huge downgrade from Android, and I wish whomever is responsible could fix that.. That's probably my biggest annoyance with my iphone.