One of the updates some months ago (6+ mo?) had "improved on-wrist detection", which I guess was better at turning off the OHR when you weren't wearing the watch. What it didn't do is stop the watch from vibrating for notifications when I'm not wearing it. My watch will be sitting on the table, and every time I get a text/email/notification on my phone, it will vibrate a few seconds after the phone. I'm not wearing the watch, so there's no purpose to it notifying me. Eventually I turned off notifications outside of an activity because I couldn't find another way to make it stop.
I don't understand why this hasn't been addressed long before now, and I wasn't able to find any other reference to it in the forums. Is there a way to turn this off, or is it just an oversight that was never addressed in a dozen+ major version updates?