Yes, that's how it's supposed to work. But there are a bunch of edge cases usability-wise that it fails to handle. It is incredibly thoughtless to automatical

Yes, that's how it's supposed to work. But there are a bunch of edge cases usability-wise that it fails to handle. It is incredibly thoughtless to automatically quit an app the split second the user switches away from it, particularly if that user explicitly launched the app and has been using it for the last hour. It has always been perfectly acceptable to close all of your windows and then hit Command+N or Command+O to open a new document. And that's even more important now that you must use Command+O to browse your iCloud documents. But if something happens in between those steps, say an email comes in or you need to look something up, then it breaks in a really bad way. It also has nothing to do with iOS. iOS never tries to guess that you've finished working with an app, never prevents you from switching to an app, never removes an app icon from Springboard or task switcher. Indeed, this form of Auto Termination is the exact opposite of how iOS operates. It also has nothing to do with conserving resources. These "terminated" apps remain running the background, consuming memory. The OS simply prevents you from switching back to an app that you were previous using. It is strictly a Windows UI feature, and a very unwelcome one.