the rate the tech for these is improving is crazy fast.
But here's the point, I couldn't give a stuff what rate the tech is advancing. What I care about is whether the "thing" gives me any benefit. Tech and benefit are not the same thing. My trousers are very low tech but I find them beneficial for keeping my loose change in and stopping me from getting mobbed by hordes of adoring ladies. (OK, I've never actually tested out that second bit but in my heart of hearts I know they wouldn't be able to help themselves). I still don't see what benefit these devices would give me that I can't fulfil better and cheaper through another means.