So don't keep yourself logged in all the time if you are in a situation that would put your account at risk of being used by someone else, for example a child or sibling. It's pretty simple to police that yourself. We are all responsible for our account security. 

I was being a bit facetious there, due to the fact that "little brothers" have caused such an extensive amount of mayhem over the years. You are entirely correct about account security, Ophelia.

seems like a bit of a pointless addition imo.

if you are playing from the same device(s) and you trust no ones gonna jump on them and abuse your game we all have the option for whichever device to remember user name and pw and auto fill it in (or just keep it filled in) already. I'm not sure what difference this will really make. seems like developer time could be spent doing something relevant and meaningful to the game :s