That's basicly what I think since i own a Pebble Time Steel. On Ubuntu Touch, using this great app: https://open-store.io/app/rockwork.mzanetti
For those who do not want notifications, of course you can disable it (all/per app). On my side i need agenda notification, and that brillant. Never miss a planned event, so i'm not going back to analog watch. Since the watch has memory, event if you are disconnect with the phone, you have most of them synched on your hand.
The only issue I had with Pebble Time Steel was the battery, even after changing it, was up for maximum a week. Now with a almost a month + a keychain charger type C adapter, i can't but stuck with an empty battery.
Looking forward to use "find my phone" feature on Ubuntu Touch (I think it's already here on Android)