Users are not interacting with a screenshot. If you try to tap the slider it will slide a little to the right and fall back to indicate it’s a slider. There are also other actions on the watch that use this kind of interaction. And if you fail to either call ems or confirm you’re OK, it will call them for you.
Yes, they are. You seem want a distressed user to aimlessly wonder though the UI trying to learn how every object behaves. That's not only unreasonable, on this case it's mean.
You would be correct if it was a game.
I agree with you more than the GP, but this isn't a good way to structure a rebuttal.
Though a return to a little bit of depth in interface design would help. Even plain tappable buttons often have zero affordance these days.
People can’t interpret that kind of nonverbal/abstract cues. It’s quite an inner circle thing of nerds that those seem ultra obvious.
Nerds would type SOS at a command prompt.