They shelved it because it didn't work. I have a very normal English accent (think BBC) and the voice recognition was extremely unreliable. Super frustrating experience. Plus nobody wants to use a voice interface in public.
I dunno if we ever really saw how the "camera on your head" social aspect would have played out because they were too shit for anyone except the curious rich to buy them in the first place.
This thing seems to work (well in theory anyway) without a voice interface which is much saner.
That doesn't make any sense. As you say, in that case you have to "spread leftovers", but that isn't really any more difficult with floats than integers.
It's better to use integers, sure. But you're waaaay over-blowing the downsides of floats here. For 99% of uses
f64will be perfectly fine. Obviously don't run a stock exchange with them, but think about something like a shopping cart calculation or a personal finance app. Floats would be perfectly fine there.