abcZ I've never been able to understand the mentality behind a "smart watch". You're already carrying a phone, which does everything the watch does, but BETTER.
I agree with you with one exception - watch is indispensable for fitness tracking. I cant imagine running, swimming, or kayaking with a phone. A watch also provides more details and more accurate data than if you were using a phone for the same tracking. But, to limit data sent to Google, instead of wear OS watches I went with Garmin - it works with GOS, has Garmin Pay on the watch (just like Google Pay), not linked to Google (I actually have my Garmin account on it's own email alias not linked to anything else), has better sensors, and battery range of 29 days
abcZ agree on the rest - some stuff is mildly more convenient than just using a phone but most is just damn creepy
To the OP MajestyNL , de-googling would mean to stop using Google devices and services which you apparently dont want to and therefore artificially installing "privacy" barriers for yourself would be nothing but charades with no privacy benefits. Just dont kid yourself.
Switching to GOS would provide some usability and security benefits - security hardened OS, better battery life (unless you install apps that kill it), no preinstalled junk apps, more control over phone hardware and settings