Ok, this article makes sense. I have noticed different behavior with different apps. Notably, some apps do close out, while others remain in the background and some switch to services.
http://www.howtogeek.com/169549/what...ent-apps-list/
The video appears to explain it the same. Not all apps are completely closed. And he mentions the switching to services. I notice some apps just stay in the background. Also, at the end of the video he states swiping them "pretty much" frees all memory. From what I see, it is less than what he implies, but I'm sure this would be dependent on what type of apps one typically runs.
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