WearOS on the Pixel Watch finally supports DND sync again!
Back in the Android Wear says, this used to be a feature on my Moto 360, but then in WearOS' next generation/rebranding the feature was lost. Under the idea of separating the watch and phone they somehow just couldn't even include the setting to opt into this.
Just like setting off a timer or alarm on the phone would go off on the watch... Alarms are back (bidirectional too!) but not the timers sadly.
I guess we finally have the technology to sync the two devices again without an external app being installed on both.
I only have my Pixel so I'm not 100 sure, but I doubt it would be required. I don't think any of the WearOS features ever required a specific phone in order to use it, at least from what I remember.