I precisely like garmin watches because if you don't setup their bluetooth, you are not tracked by anyone, it's not required to connect to servers etc... It's enough for me because I only need to check BPM.
Of course there isn't any guarantee that at some point, some marketing manager won't decide to break that.
(Assuming there aren't any time bombs waiting in the code only to be fixed by a firmware update, like the GPS week number epoch rollover, of course.)