Sleep monitoring to wake me up with a slight, easy buzz on my wrist sensing when I'm in the lightest phase of sleep. Heartbeat sensing and accelerometer will just do for the job but wait, I can't because I have to take it off at night to charge since wireless charging never came true and I probably couldn't go to sleep with a bulky watch on my wrist.
I so wanted this thing to be about sensors and improving life and being very lightweight without a screen but noooo, it had to be about notifications. I don't want to look at photos or twitter on my wrist.