Similar to “Never Let Me Go”, Ishiguro likes to do this sort of vaguely dystopian sci-fi where he doesn't quite flesh out all the details.. I need answers, damnit!!
Why is Karla decommissioned but left “alive”? Wouldn't it be kinder to turn her off? And the sun is probably just a regular old sun, that Klara is mistakenly expecting to be a God that can save Josie - but then it does? Is that just a coincidence?