But this is really interesting: it sounds like the display works, and it sounds like the puck is workable, and it sounds like both can squeak above the line in terms of battery life. If those things are true I may turn out to have been completely wrong.
I don't know the first thing about silicon carbide display substrate thingy yields, so I can't remark on whether or not that's a "scale will make cost acceptable", but I bet some mega geniuses at Meta think so or they probably wouldn't be showing this much.
If it turns out that I was dead wrong on this I'll be glad I was, it would be really cool if it works.