If, at some point in the future, we get small, handy, cheap, good quality cameras that people make a habit of always carrying around, then surely the nature of these phenomena will easily be determined.
More so. Mid-nineties web static images were either jpg og gif. Preferably gifs, which mostly compressed way better for anything but photos. With proper indexing, color limitation, dithering, bitcount, and vigilant observance of proper websafe color palette you could shave amazing extra kilobytes off precious bandwith. Animations were for Geocities.
That was my thought, too. Day to day, my phone alarm is fine (and I damn well tested it thoroughly before actually relying on it), but if anything life-and-death is scheduled, I'll use at least one independent extra device. And all this even though I always wake up on time and never am late.
Likewise, the phone call problem has an easy solution: Assign different sounds to different callers; low and unobtrusive to the unwanted ones.
And the delivery: Never trust such a thing without sufficient fallbacks. If you want safety and full control, organise the thing yourself.
All in all, I get a vibe that the poster may be a wonderful coder, but really hasn't got the paranoid mindset required for mission critical work.
There's also the Nohari window. We did both in our team and man the Nohari led to some interesting situations. Would not recommend unless your team is very close and chill.
With the Johari, the "negative" basically shows by the qualities you attribute to yourself, but nobody else attributes to you.