These units ship with nothing but a BIOS, and that's basically the only programming on-board for the first few months. No functionality except boot, sleep (no scheduler included), system bell (massively over-used), charge power, and flush buffer (far too frequently). You have to wait over a year just to get basic resource management and decent device drivers. I don't know how you can even call it UX before around the two-year mark, as there's no meaningful I/O, and no functionality that delivers any real value, until then.

The whole "child" thing is great for DIY enthusiasts, but totally impractical for the rest of us.