While I instinctively dislike any "secretly spying" devices, phones could do that for a while now. I wouldn’t have much use for my watch doing it, but my nephew swears by taking notes on an ipad with an app that has a sort of a playback: essentially a play bar that recreates the note as it is written, with audio included. Being able to playback the lecture afterwards that way is a huge benefit over pure notes and I wish I had something like that when I was in school.

There's a difference between "weird people could choose to do this creepy thing and violate my trust" and "not weird people could forget to turn off this slightly less creepy thing and still violate my trust" Both of these suck, but honestly I don't appreciate that Apple is making me feel uneasy talking around my friends with Apple Watches. Not because I don't trust my friends, but because now it takes extra work for them to not do something kinda creepy.

Friction makes all the difference. Google used to sweat over 100ms in page loading.

Running a voice memory all day long is one thing. Pressing a button that automatically summarizes every conversation you'll ever have is a step change.